Goals either side of half-time from James Forrest and Beram Kayal gave Celtic a 2-1 UEFA Champions League win over Ajax on Tuesday.
Having fallen to Group H defeats against Milan and Barcelona, triumph over the Eredivisie outfit represents a huge boost to the Scottish champions' European hopes.
But it was tough going at times for Neil Lennon's men, with Christian Poulsen striking the post for the visitors before Forrest converted from the spot thanks to Stefano Denswil's 43rd-minute foul on Anthony Stokes.
Beram's speculative deflected drive early in the second period sent the home crowd into raptures, while Thulani Serero spurned Ajax's best two chances and drew a rash tackle from substitute Nir Biton that meant Celtic finished with 10 men before Lasse Schone netted an emphatic consolation as the game's final act.
Kayal replaced suspended Celtic captain Scott Brown in the centre of midfield, while Forrest was rewarded for his equaliser from the bench against Hibernian with a start on the right wing in place of hamstring victim Kris Commons.
Joel Veltman started his first Champions League game for Ajax in central defence as manager Frank de Boer also restored veteran midfielder Poulsen.
After an enterprising start from the home side, it was Ajax who went closest to opening the scoring when Poulsen steered a side-footed volley against the post with half an hour played after Charlie Mulgrew failed to clear a free-kick from Viktor Fischer.
But just as Celtic were beginning to toil they took the lead on the stroke of half-time after Denswil clumsily felled Stokes on the left-hand edge of the penalty area.
Debate over Forrest's spotting of the ball ensued, with Veltman, Poulsen and Celtic's Virgil van Dijk booked for their part in the argument, but the 22-year-old kept his cool to drill the kick beyond Jasper Cillessen's dive into the top right corner.
Perhaps buoyed by his end to the first-half, Forrest rampaged in from the right and forced Denswil to scramble clear at the near post two minutes after the restart.
Fraser Forster produced a stunning save to thwart Serero following the Ajax midfielder's slick one-two with Kolbeinn Sigthorsson, before Celtic claimed an unlikely two-goal cushion in the 54th minute.
Georgios Samaras cut in from the left byline to have a goal-bound effort blocked by Veltman and the loose ball fell to Kayal, whose clipped 25-yard effort took a decisive deflection off Denswil to nestle in the bottom corner.
Siem De Jong fizzed a drive from distance narrowly past the far post as Ajax sought a route back into the game, while Kayal wonderfully spun Serero before thudding another well-hit effort into Cillessen's chest as the game entered its final quarter.
Serero found space in the Celtic box with 11 minutes remaining but missed his kick before blazing over and Ajax reached the halfway point of the group stage with a solitary point despite Biton's late censure and fellow sub Schone's last-gasp intervention.
|5||V. van Dijk||44'|
|Coach: N. Lennon|
for B. Kayal 71'
for M. Lustig 77'
for T. Pukki 90+1'
|Toure shunning lavish China interest to stay at City, says Seluk|
|Rahman´s AFCON in the balance, says Ghana boss Grant|
|Just 14 goals conceded and nine clean sheets - How Vertonghen blow could impact Tottenham|
|Ghana 1 Uganda 0: Andre Ayew hands Black Stars nervy victory|
|Swansea snap up Carroll and Olsson in double swoop|
|All is forgiven? - Costa trains with full Chelsea squad after reported Conte bust-up|
|I would throw myself off a bridge for Luis Enrique - Rakitic dismisses Barca rift rumours|
|Was Juventus´ new logo inspired by tennis star?|
|Smooth sailing for Liverpool in Plymouth? Klopp expects tough test|
|Demichelis re-joins Malaga until end of season|
|Cameroon v Guinea-Bissau: Broos urges new heroes to emerge|
|Boxing champ hits Carragher with Chinese Super League comeback prank|
|Zidane backs Navas and defends Benzema as Madrid aim to bounce back|
|Deportivo bring in Kakuta from Hebei after CSL rule changes|
|Matip could miss eight games without doing anything wrong - Klopp|
|United trigger Valencia´s contract extension|
|Ronaldo returns to Real Madrid´s Copa squad|
|FA fine Sagna for Instagram post|
|Nedved does not foresee more January business for Juventus|
|Rafinha injury blow for Barcelona|
|Villas-Boas fumes at CSL foreign player crackdown|
|Ibrahimovic invaluable to Manchester United youngsters - Rashford|
|Robben rejected China move|
|A-League review: Phoenix rise to the occasion to end Victory´s streak|
|Van Gaal slams English media over treatment at Manchester United|
|Mignolet: Liverpool in better position to win title than in 2013-14|
|Giroud wants Premier League title but understands China temptations|
|Tianjin forced to scrap moves for Costa, Benzema, Cavani and Falcao|
|My goal was better than Mkhitaryan´s - Giroud|
|Pochettino not interested in Argentina job|
|Kane: Tottenham can win Premier League|
|Corinthians dreaming of Drogba - Paulo Roberto|
|Coutinho calls for Liverpool focus|
|Chiellini compares Pogba to LeBron and Bolt|
|Maradona to become Napoli ambassador|
|Mihajlovic furious after Torino collapse|
|Icardi has offers from China - Wanda Nara|
|Pogba can cope with pressure - Ibrahimovic|
|´My half-time words will stay in the dressing room´ - Montella annoyed with AC Milan|
|Juventus unveil dramatic change to club logo - but not everyone´s a fan|
|´I do not think I will return to coaching´ - Van Gaal set to call it quits|
|Torino 2 AC Milan 2: Bacca caps thrilling comeback as hosts pay the penalty|
|DR Congo 1 Morocco 0: Kabananga pounces on blunder to give 10 men the points|
|´Happy and comfortable´ Sanchez dismisses Arsenal exit talk|
|How much?! West Ham flop Simone Zaza could cost Valencia €20m|
|Mali v Egypt: Salah leads Pharaohs´ bid for AFCON glory|
|Sevilla concede they ´cannot force´ sporting director Monchi to stay|
|Ivory Coast 0 Togo 0: Reigning champions held to opening draw by Adebayor and co.|
|Goalkeeping woes, Stones and tactical confusion - How Guardiola is making life difficult for himself|
|Ozil and Sanchez can be persuaded to stay - Cech|
|Pogba: I rejected Barcelona and Real Madrid|
|Ghana v Uganda: Gyan dreams of first trophy since 1982|
|Chiellini: Juventus a work in progress|
|Robben agrees Bayern renewal until 2018|
|Hazard: Goals do not matter to me|
|Bennell pleads not guilty to eight child sex offences|
|Muller fed up with debate over Bayern role|
|Wenger glad Sanchez is not ´a Costa problem´|
|Flick resigns as DFB´s sporting director|
|Gomis ´can´t wait´ to welcome Payet to Marseille|
|Chinese FA changes foreign player rules after ´irrational´ spending|
|Like father, like son: Justin Kluivert follows in dad´s footsteps|
|´No reason to lose him´ - Marotta rubbishes talk of Allegri exit|
|Courtois: We don´t need Costa|
|Kane: Tottenham players won´t go to China|
|Noble ´angry and disappointed´ with Payet|
|Klopp furious over Matip uncertainty|
|Wenger surprised by tight Premier League|
|´Money is not everything´ - Conte issues warning amid China speculation|
|Fiorentina defeat a ´bad setback´ - Allegri|
|´This will elevate this group of players´ - Sampaoli revels in Sevilla late show|
|WATCH: Rio Ferdinand screams and dances in crazy Man Utd celebration|
|Real Madrid relaxed, admits Zidane after Sevilla defeat|
|Monaco go top of Ligue 1 with stunning Marseille victory|
|Ronaldo equals LaLiga penalty record as Real Madrid lose|
|Sevilla 2 Real Madrid 1: Stunning late comeback ends unbeaten run at 40|
|Fiorentina 2 Juventus 1: Brilliant Viola breathe life into Serie A title race|
|Tunisia 0 Senegal 2: Mane on target as favourites start strongly|
|Mourinho explains Klopp confrontation|
|Klopp delights in Alexander-Arnold display|
|Algeria must cut out mistakes against Tunisia - Leekens|
|Long balls led to Man Utd equaliser, says Klopp|
|´We attacked, Liverpool defended´ – Mourinho insists a point flattered Klopp´s men|
|DR Congo v Morocco: ´Confidence´ the Atlas Lions´ biggest hindrance ahead of AFCON opener|
|Ibrahimovic: Direct tactics worked for United|
|Guardiola rues gap to Chelsea after Goodison mauling|
|Algeria 2 Zimbabwe 2: Mahrez double prevents shock defeat|
|Manchester United 1 Liverpool 1: In-form Ibrahimovic saves hosts|
|Ivory Coast v Togo: AFCON champions hope to tame Le Roy´s ´troublemakers´|
|Guardiola lays City´s mental frailties bare after Goodison rout|
|Koeman hails ´perfect´ Everton after City mauling|
|Nice stalemate gives Monaco chance to go top|
|Guardiola suffers heaviest league loss in Everton thrashing|
|Neymar-esque Zaha is England´s loss – Bolasie|
|Everton 4 Manchester City 0: Koeman leaves old pal Guardiola´s title bid in tatters|
|Matip withdrawn from Liverpool selection over eligibility questions|
|Podolski staying at Galatasaray, insists sporting director|
|Cavani wants PSG stay|
|Torino move feels normal now – Hart|
|Chinese FA changes rule on CSL foreign players - reports|
|Bayern complete swoop for Hoffenheim duo Sule and Rudy|
|Aubameyang: Dortmund not really like Barca, Madrid or Bayern|
|Pogba can chance a game in one second - Herrera|
|Newcastle Jets 2 Perth Glory 2: Keogh´s eighth of season seals draw|
|Klopp: Liverpool ready for Old Trafford test|
|Herrera taunts Liverpool ahead of Old Trafford showdown|
|I had to be 100 per cent to stay at Boca - Tevez|
|No player is bigger than the club - Carroll takes swipe at want-away Payet|
|Icardi: I can always move to China at end of career|
|Mkhitaryan: Klopp convinced me not to join Liverpool|
|Mourinho: Pogba can score every game|
|Cameroon´s profligacy frustrates Broos|