Manuel Pellegrini has slammed referee Jonas Eriksson after Manchester City's 2-0 UEFA Champions League last-16 defeat to Barcelona.
The Spanish champions went ahead in the first-leg clash through a Lionel Messi penalty nine minutes into the second half, but replays suggest Martin Demichelis' challenge on the forward, which saw him get sent off, may have happened just outside the area.
Daniel Alves doubled the advantage in the closing stages at the Etihad Stadium, but Pellegrini took umbrage with the performance of the Swedish official.
"Of course I have a complaint, for the whole match I feel we didn't have a referee who was partial for both teams," he told Sky Sports. "It was not a good idea to put a referee from Sweden in charge of such an important game.
"The referee was three metres from a foul (on Jesus Navas in the build up to the penalty decision), he didn't give it and it was a foul outside the box (for Demichelis' tackle on Messi)."
Eriksson previously endured the wrath of Barca captain Carles Puyol and former boss Pep Guardiola following a Champions League quarter-final clash with Milan in 2012, and Pellegrini believes his appointment for this fixture was an error.
"I think it was a mistake to nominate a referee who had previously had problems with Barcelona in the past," he continued. "We had the same referee and once again he made mistakes."
Meanwhile, City captain Vincent Kompany believes his side can feel hard done by.
"2-0 is very tough on us," he told ITV. "When it was 11 v 11 we were in the game but with a man less and with their individual quality which is so high it was very hard.
"If they play as they can in the second leg it will be very hard but we still have a chance."
|Coach: M. Pellegrini|
for A. Kolarov 58'
for Jesús Navas 58'
for Negredo 74'
|Lemina rejects Gabon call-up|
|Toure a doubt for Sunderland clash|
|Millen ´ready´ to manage Palace|
|Carver urges Newcastle to kick on|
|Bellarabi extends Leverkusen deal|
|Wenger hails ´committed´ Arsenal|
|Diouf will be missed - Hughes|
|Millen elated at resolute Palace performance|
|Lambert: Big point for Villa|
|Martinez rues Cisse decision|
|Dyche delighted by Burnley character|
|Allardyce: Officials got it horribly wrong|
|Poyet rues dropped points at Villa|
|Bruce frustrated as dominant display yields no points|
|Pellegrini laments key turning points in Burnley setback|
|Newcastle United 3 Everton 2: Pardew´s men impress at St James´ Park|
|League One Review: Swindon climb into second, MK Dons suffer surprise defeat|
|Championship Review: Bournemouth go four points clear, Boro held|
|Koeman hails Southampton spirit|
|Inverness Caledonian Thistle 0 Aberdeen 1: Pawlett strikes sends McInnes´ men second|
|Mourinho fumes at ´campaign´ against Chelsea|
|Manchester City 2 Burnley 2: Barnes claims a point to deny champions|
|West Ham 1 Arsenal 2: Wenger´s men climb above hosts|
|Hull City 0 Leicester City 1: Mahrez fires Pearson´s men to victory|
|QPR 0 Crystal Palace 0: Millen makes solid start as temporary Palace boss|
|Aston Villa 0 Sunderland 0: Delph sees red in stalemate|
|Stoke 2 West Brom 0: Diouf brace secures back-to-back wins|
|Southampton 1 Chelsea 1: Mourinho´s men end 2014 on top|
|Van Gaal frustrated with wasteful finishing|
|Pochettino content with goalless draw|
|Tottenham 0 Manchester United 0: Honours even at White Hart Lane|
|Klose vows to fight for Lazio place|
|Hughton admits interest in Palace and Brighton roles|
|Injuries not behind retirement plans, says Rolfes|
|Podolski: Arsenal exit not a formality|
|Wellington Phoenix 1 Western Sydney Wanderers 0: Krishna wins it|
|Taylor wary of ´beast´ Lukaku|
|Al Habsi to lead Oman at Asian Cup|
|Lacazette will stay at Lyon - Aulas|
|Southampton like Atletico, says Alderweireld|
|World Cup held PSG back - Blanc|
|Everton facing ´pivotal´ moment - Martinez|
|Zamora urges QPR to tie down Austin|
|Badstuber, Alaba set for New Year return|
|Burgos: Atletico will get the best out of Torres|
|Chelsea to offer Terry new deal - Mourinho|
|Rodgers excited by Sterling development|
|Strinic close to finalising Napoli switch|
|Torres to join Milan on permanent deal|
|Scottish Premiership Review: Celtic held to shock draw, rivals fail to capitalise|
|Wenger sings Song´s praises|
|Pochettino calls for bravery|
|West Ham could lose Allardyce - Sullivan|
|League One Preview: Saunders takes charge for Colchester clash|
|Aguirre denies any involvement in La Liga match-fixing scandal|
|Mourinho impressed by Koeman´s Southampton|
|QPR v Crystal Palace: Millen recast in familiar role|
|West Ham v Arsenal: Allardyce eyes further home comfort|
|Elusive Coppa Italia on Juventus´ wish list - Marotta|
|Jones eyes swift response|
|Millen focused on QPR clash|
|League Two Preview: Shrewsbury, Wycombe and Burton vie for year-end top spot|
|Mancini not expecting big-money signings at Inter|
|Tottenham v Manchester United: Carrick expects tough return|
|Pearson eager to see Leicester resolve|
|Newcastle United v Everton: Martinez demands clinical touch|
|Liverpool v Swansea City: Rodgers backs returning Mignolet|
|Bayern can still improve - Sammer|
|Warnock sacked by Palace|
|Aston Villa v Sunderland: No club too big to go down, says Lambert|
|Hull City v Leicester City: Pearson vows to keep going|
|Stoke City v West Brom: Hughes targets elusive back-to-back wins|
|Rodgers dismisses Balotelli exit rumours|
|Modric will not rush Madrid return|
|Dyche pleased with Vokes return|
|Southampton v Chelsea: Koeman vows to go on the offensive|
|A-League Review: Six-goal Gosford thriller, Victory leave it late|
|Manchester City v Burnley: Pellegrini warns against complacency|
|Dortmund can fight on two fronts - Watzke|
|Sterling hails improved Liverpool belief|
|Rosicky eager to build on QPR winner|
|Wenger: ´We made it hard for ourselves´|
|Kane: Spurs eye top four|
|Di Maria in doubt for Spurs clash|