Steve Clarke rued West Brom's inability to convert their chances following their 2-0 home defeat to Norwich City on Saturday.
Hosts West Brom fell behind to Gary Hooper's 13th-minute opener before Clarke sent on Saido Berahino and Shane Long at half-time in an attempt to get back into the match.
Clarke's side did have the better of the second period, dominating possession, but were guilty of spurning their chances, with Stephane Sessegnon particularly culpable with one glaring miss shortly after the break.
The Benin international broke through the heart of the Norwich defence, but sent his effort wide of the post from 15 yards with just John Ruddy to beat.
That miss was to cost the hosts dearly as Leroy Fer wrapped up the win with a goal on the break a minute from time.
Defeat left Clarke in downcast mood after a frustrating afternoon.
"We created a lot of chances, but we didn't get the goal," said the West Brom head coach.
"We made it difficult conceding the first goal and from there it gives them something to hold onto.
"It was two teams feeling each other out and from nowhere they got the first goal and it set us on back and put us on the back foot."
Clarke was quick to defend Sessegnon, who also had a goal-bound effort seemingly blocked by the arm of Martin Olsson five minutes before his miss.
"We will keep faith in him," said Clarke.
"We will keep believing in him because that's the type of player he is, he got in a couple of great positions and contributed a lot to the team performance.
"Instead of rolling it six inches outside the post he should have rolled it six inches inside the post but these things happen."
It completed a bad seven days for West Brom, who lost 2-1 at Newcastle United last weekend before a midweek home defeat to Manchester City.
"It has been a difficult week," said Clarke.
"Three defeats are sore, painful and hard to take. Next week we have to go to Cardiff and be resilient and we have to start getting points on the board, there's no easy solution."
|Coach: S. Clarke|
for L. Ridgewell 46'
for M. Amalfitano 46'
for V. Anichebe 81'
|Porto 2 Penafiel 0: Danilo scores in farewell game|
|La Liga Preview: Eibar, Almeria hoping for final-day salvation|
|Eredivisie play-offs: Go Ahead suffer surprise defeat, NAC win|
|South Africa warm up for COSAFA Cup with victory|
|Rodriguez will be like a new signing - Adkins|
|Renard leaves Ivory Coast role amid Lille speculation|
|Howedes doubtful for start of next Bundesliga campaign|
|Deschamps: Pogba and Evra will be happy to face Albania|
|Everton v Tottenham: Pochettino eyeing fifth spot|
|Crystal Palace v Swansea City: Pardew admits to talent envy|
|Van Gaal confident of keeping De Gea|
|Spurs to support Adebayor over family issues|
|Manchester City v Southampton: Koeman expects no favours from hosts|
|Chelsea v Sunderland: Champions set to finally lift trophy|
|Mancini: Inter need quality|
|Van Gaal: No favours for ex-United captain Bruce|
|Leicester City v QPR: Ramsey expects doomed Rangers to show pride|
|Koeman expecting quieter close season|
|Hughes delivers positive update on Bojan|
|Advocaat considering Sunderland offer|
|Hull City v Manchester United: Bruce accepts survival is tall order|
|Stoke City v Liverpool: Rodgers keen to move focus away from Sterling|
|Allardyce won´t let us down, says Bruce|
|Berahino can leave for top-four club - Pulis|
|Aston Villa v Burnley: Sherwood wanting win ahead of cup final|
|Big clubs would be making a ´mistake´ signing Bolasie|
|Peterborough announce Robertson as new manager|
|Relieved Sherwood eager to kick on|
|Newcastle United v West Ham: Carver dreading ´unbearable´ drop|
|Pellegrini unsure over Milner future|
|I am not good enough to win treble every year - Guardiola|
|Luis Enrique refuses to be drawn on Barca future|
|Ntep handed France call-up|
|Allegri compares Juve to class of 2003|
|My future to be decided on Monday - Allardyce|
|Ancelotti expects to stay at Real despite speculation|
|Play-off finals to go ahead despite discovery of World War II bomb|
|Mourinho lauds ´legend´ Lampard|
|Milan v Torino: Shadow of Ancelotti hangs over Inzaghi|
|Speroni extends Palace contract|
|Ramsey issues QPR warning|
|Valverde signs new Bilbao contract|
|Welbeck could miss FA Cup final and England double header|
|League One play-off final Preview: Preston hoping to end hoodoo|
|Rodgers expects Sterling talks to resume|
|Martinez dismisses Oviedo exit talk|
|Neil hoping to draw on previous play-off success|
|Cisse weighing up offers from USA, India and Poland|
|Hazard announced as Premier League´s Player of the Season|
|United should sign Cech if De Gea leaves - Scholes|
|Copa Libertadores Review: Cruzeiro draw first blood away from home|
|MLS Preview: Wondolowski poised for 100-goal club|
|Ligue 1 Preview: Monaco, Marseille, Saint-Etienne battle for Champions League spot|
|Bundesliga Preview: Relegation battle set for dramatic end, Dortmund to farewell Klopp|
|Serie A Preview: Radu in doubt for crucial Rome derby|
|Stankovic denies talk of Inter return|
|Benitez would be ´happy´ to manage Real - agent|
|Newcastle not expecting favours from Allardyce - Carver|
|Lacazette can be ´world class´ - Houllier|
|Hodgson defends Sterling|
|Eredivisie Review: Heerenveen and Vitesse seize initiative|
|Prince Ali confirms World Cup expansion plans|
|Giroud hits back at ´dull´ Henry over Arsenal comments|
|Real Madrid v Getafe: Ancelotti banned in potential Bernabeu farewell|
|Stoke secure permanent Wollscheid deal|
|Ligue 1 relegation places cut to two|
|Bayern Munich v Mainz: Champions out to ring in title with return to form|
|Granada v Atletico Madrid: Tiago ready for difficult final day|
|Luis Figo statement on FIFA president candidacy withdrawal|
|Barcelona v Deportivo La Coruna: Xavi prepares to bid farewell to La Liga|
|New Liverpool deals for Ibe and Flanagan|
|The tooth hurts for Hazard as he looks set to miss Sunderland clash|
|Juventus v Napoli: Double winners prepare to celebrate|
|Luis Figo withdraws from FIFA presidency race|
|Bielsa not expecting contract offer from Marseille|
|Hodgson: No England rift with United over Shaw|
|Genoa v Inter: Mancini´s men chase European berth|
|Borussia Dortmund v Werder Bremen: Klopp looks to sign off with European qualification|
|Bartomeu hits out at Ancelotti to Barca rumours|
|Paris Saint-Germain v Reims: Parisians ready to celebrate title triumph|
|I have not spoken to any clubs, insists Klopp|
|League Two play-off final Preview: Ainsworth claims underdog status|
|Sheringham named Stevenage boss|
|Lawless banned for football betting|
|Defence should be United´s priority, says Stam|
|Klopp vows to ignore nostalgia at final home game|
|Hodgson excited by new England call-ups|
|Xavi: Barca will survive without me|
|Benzema sustains hamstring injury|
|Maiden England call-ups for Austin, Vardy and Heaton|
|Kramer relishing Leverkusen return|
|Xavi confirms Barcelona departure|
|Sterling ´definitely not signing´ new Liverpool deal - agent|
|Herrera eyes second-season improvement|
|Kane plans long Tottenham stay|
|Schmidt signs new Leverkusen deal|
|Sterling should stay at Liverpool, says Redknapp|
|Van Praag withdraws from FIFA presidential race|
|Financial fair play here to stay, warns Platini|
|Zidane: Gerrard and me are alike|
|Drobny ruled out of Hamburg finale|
|Defoe: We want Advocaat to stay|
|Zorc expects Hummels to stay|
|Wilshere happy with position|
|Moreno talks up Europa League|
|Santa Fe 1 Internacional 0: Mosquera nets injury-time winner|
|Sporting Kansas City 4 New England Revolution 2: Nemeth inspires victory|
|Dunga calls up Fred, Felipe Anderson for Olympic trials|
|Koke wants to be Atleti´s Gerrard|
|Tinkler: FFA are ripping off owners|
|Klopp will excel at big club - Feulner|
|Allegri concedes cards fell Juve´s way|
|Estoyanoff cops six-game ACL ban for punching|
|Desailly: Mourinho would have won title with City|
|Teary Advocaat delighted to silence the Sunderland doubters|
|Pioli bemoans Lazio´s lack of luck|
|Chiellini salutes Juve fight after Coppa triumph|