Jose Mourinho fumed at officials following Real Madrid's 1-1 draw at Lyon in the Champions League, claiming a missed handball could prove decisive in the round of 16 tie.
Karim Benzema scored against his old club before Bafetimbi Gomis' last equaliser kept the tie wide open ahead of the second leg in Spain, but it could have been a different story had the expanded referee team awarded a penalty when Cristiano Ronaldo's free kick appeared to hit a defender's arm just after the hour mark.
"It's difficult to be a referee and there are errors in matches that are due to fatigue or slowness to react," Real Madrid boss Mourinho said. "These are the errors we have to accept. After, there are other errors that you can't accept. There was a free-kick and in the slow-motion replay you can see it clearly.