Jose Mourinho endured frustration on his return to UEFA Champions League action with Chelsea as Basel came from a goal down to win 2-1.
Six years to the day after a 1-1 draw with Rosenborg that represented the final game of Mourinho's first spell in charge at Stamford Bridge, Chelsea were stunned by second-half goals from Mohamed Salah and Marco Streller.
Oscar fired the hosts ahead in the 45th minute in the Group E clash with his sixth goal in seven Champions League outings and the Brazilian also hit the bar prior to Salah’s classy left-footed leveller.
That goal prompted Chelsea to throw men forward, yet it was Basel - always dangerous on the break - who struck again when Streller beat Petr Cech with a near-post header from a corner.
Willian was handed his Chelsea debut and Marco van Ginkel a first start as Mourinho made five changes from the side beaten 1-0 by Everton at the weekend.
Basel recalled a host of players after fielding a weakened side for their Schweizer Pokal victory against Munsingen.
Mourinho's men unsurprisingly started the game on the front foot, albeit without creating any clear-cut opportunities.
There was a scare for Basel goalkeeper Yann Sommer in the 15th minute when he fumbled a corner from the left, but a free-kick was swiftly awarded in his favour.
The pacey Salah - a scorer at Stamford Bridge in last season's Europa League semi-final between the two sides - represented the main threat when Basel launched occasional attacks.
After Eden Hazard had spurned a rare clear sighting of goal for Chelsea following good work from Samuel Eto'o, Salah also proved wasteful when cutting in from the right and curling a shot over the bar.
Despite dominating possession and the corner count, the hosts remained frustrated as half-time approached.
However, Chelsea were lifted on the stroke of the interval as Oscar popped up with a timely goal.
David Luiz set the attack in motion by stepping into midfield and Oscar latched on to a delicate throughball from Frank Lampard to find the bottom-left corner with a first-time shot on the turn.
Streller was close to connecting with a left-wing cross early in the second half before Oscar struck the bar at the other end with a tremendous effort from just outside the area.
Hazard failed to hit the target once again either side of Branislav Ivanovic twice threatening from set-pieces.
Chelsea were then punished for not extending their lead when a cross from the left broke via Streller to Salah, who emulated Oscar by only requiring one touch to find the net.
Although Chelsea poured forward in search of a late winner, it was Basel who finished the stronger and their encouraging play gained reward as Streller shocked the home crowd.
|16||M. van Ginkel||42'|
|Coach: José Mourinho|
for Willian 67'
for F. Lampard 76'
for M. van Ginkel 76'
|Liga de Futbol Profesional Boliviano Wrap: Top four tightens after Real Potosi, Club Universitario d|
|Juventus are a ´great team´ - Conte|
|Ligue 1 Wrap: PSG, Monaco overcome stern tests|
|La Liga Wrap: Messi stars in Barca romp, Valencia lose again|
|Serie A Wrap: Sassuolo grab vital win, Juve leave it late|
|Uruguay Primera Division Wrap: Fenix stay top, Nacional lose|
|UEFA Champions League Preview: Real Madrid v Schalke|
|Ligue 1: Paris Saint-Germain 2 Saint-Etienne 0|
|Serie A: Genoa 0 Juventus 1|
|Primeira Liga: Castro tastes Porto defeat, bottom two beaten|
|Football League Preview: Wigan, Wolves out to continue runs|
|Anderson revels in Aberdeen cup triumph|
|Wenger hails resilient Arsenal after derby win|
|Barca will attack Real Madrid, Martino promises|
|Tottenham deserved derby spoils, claims Sherwood|
|Moyes stunned by United no-show|
|Eredivisie Wrap: Twente boost title hopes, NEC off the bottom|
|UEFA Champions League Preview: Chelsea v Galatasaray|
|Rosicky and Koscielny revel in derby triumph|
|Bundesliga Wrap: Hamburg, Freiburg claim crucial victories|
|Seedorf reveals ultras meeting|
|We never gave up - Seedorf|
|La Liga: Barcelona 7 Osasuna 0|
|Premier League: Tottenham 0 Arsenal 1|
|Football League Wrap: Exeter held, Coventry claim late draw|
|Rodgers pleased with Liverpool dominance|
|Rooney laments one of his ´worst days´|
|Mihajlovic ready to make changes to Samp side|
|Cassano: I´d love to go to Brazil|
|AFC Champions League Preview: Guangzhou host Jeonbuk, Al Jazira travel to Esteghlal|
|Moyes queries referee decisions|
|Garcia urges Roma to win for Strootman|
|Gerrard warns Liverpool´s title rivals|
|Thai Premier League Wrap: Buriram finally beaten, Muang Thong held at home|
|Martinez relieved Barry avoided serious injury|
|Serie A: Milan 2 Parma 4|
|Premier League: Manchester United 0 Liverpool 3|
|Galliani ´hurt´ by Milan fan protests|
|Lopez thankful for Casillas praise|
|CSL Wrap: Batalla on target, Guangzhou lead the way|
|Lambert decision justified, claims Pochettino|
|Allardyce highlights Carroll´s importance|
|Defoe delighted with ´dream´ debut|
|Mancini ´not friends´ with Mourinho|
|Cisse has lost confidence, says Carver|
|K-League Wrap: Pohang bottom, Ulsan win again|
|Insigne targets domestic success, World Cup berth|
|Hughes wants to extend Ireland contract|
|Magath explains Stockdale selection|
|Klopp praises trio despite Gladbach loss|
|Hughton understands fans´ anger|
|Seedorf sets sights on Europe, rubbishes sack rumours|
|MLS Wrap: Defoe double stuns Sounders|
|Simeone speechless after gritty Atletico victory|
|Copa Libertadores Preview: Gremio eye commanding gap|
|La Liga Wrap: Madrid rivals win as title battle heats up|
|Primeira Liga Wrap: Pacos escape drop zone, Estoril strengthen Europe claims|
|La Liga: Atletico Madrid 1 Espanyol 0|
|Mazzarri taking one game at a time|
|Pieters boost for Stoke|
|Ancelotti praises Real´s defensive effort|
|Ligue 1 Wrap: Valenciennes, Sochaux win, Rennes lose thriller|
|Eredivisie Wrap: Seventh heaven for PSV, Den Haag ease relegation fears|
|Rivaldo announces retirement from football|
|Serie A: Verona 0 Inter 2|
|League One Wrap: Brentford beat title rivals, Notts County cut adrift|
|Lambert slams ´leg-breaking´ Ramires tackle|
|It is not important when Bayern win title, insists Guardiola|
|La Liga: Malaga 0 Real Madrid 1|
|Mourinho tight-lipped on Foy performance|
|Bundesliga Wrap: Bayern on brink of title as Dortmund slip up at Gladbach|
|Scottish Premiership Wrap: St Johnstone, Hibs both slip up|
|Pulis praises plucky Palace|
|´Calm´ Poyet cool on survival hopes|
|Carver bemoans Newcastle´s lack of luck|
|Premier League: Aston Villa 1 Chelsea 0|
|Klopp upbeat despite Dortmund defeat|
|Bundesliga: Bayern Munich 2 Bayer Leverkusen 1|
|Everton did well not to panic, says Martinez|
|Solskjaer: Cardiff denied stonewall penalty|
|Pochettino criticises team´s focus|
|Composed Stoke performance pleases Hughes|
|Monk gears up for relegation scrap|
|´Angry´ Hughton dismisses departure claims|
|Magath ´convinced´ Fulham will survive|
|Allardyce ´baffled´ by refereeing decisions|
|My position not important, says Mel|
|Championship Wrap: Leicester, Burnley march on|
|League Two Wrap: York continue play-off push, top three all win|
|Premier League: Southampton 4 Norwich City 2|
|Premier League: Sunderland 0 Crystal Palace 0|
|Premier League: Everton 2 Cardiff City 1|
|Premier League: Swansea City 1 West Brom 2|
|Premier League: Fulham 1 Newcastle United 0|
|Premier League: Stoke City 3 West Ham 1|
|Bruce backs Boyd in diving row|
|Bundesliga: Borussia Dortmund 1 Borussia Monchengladbach 2|
|Pellegrini: Jelavic fouled Kompany first|
|A-League Wrap: Wanderers´ premier chances up in smoke, Victory go second|
|Premier League: Hull City 0 Manchester City 2|
|Palacio eager to kick on|
|Neymar´s position not an issue, insists Martino|
|J.League Wrap: Ardija win seven-goal thriller, Sanfrecce beaten|
|Spurs up for derby day, insists Adebayor|
|Moyes: Liverpool are favourites|
|Rodgers warns Manchester United of title drought|
|Huntelaar: Equaliser was key moment|
|Isco welcomes Seedorf comparison|
|Wenger to investigate Arsenal injuries|
|Mourinho: TV scheduling affecting English clubs in Europe|
|Teamwork the key for Stuttgart - Stevens|
|Atletico face ´11 more´ finals in La Liga|
|Keller wants more from Schalke|
|Valcke rubbishes protesters World Cup claims|
|Blanc demands focus from PSG|
|Anigo ´half satisfied´ after Marseille draw|
|Klopp: Dortmund coping despite injury crisis|
|West Brom sack Anelka|
|Rodgers claims Sturridge can be ´world class´|