West Bromwich Albion boss Pepe Mel believes the decision to award Crystal Palace a penalty during their 3-1 loss at Selhurst Park was "laughable".
Referee Chris Foy awarded a spot-kick on 70 minutes after Marouane Chamakh was fouled by Baggies keeper Ben Foster, with the Moroccan converting to secure the points for Palace.
Foy opted against showing Foster a red card but Mel believes the decision cost West Brom the game, which sees his side drop into the Premier League's bottom three.
"The penalty decision was laughable. If it was a penalty then it would have been a red card," he said.
"I think the penalty decision really did prevent us from getting anything from the game.
"In the previous piece of play Speroni made a really great save and that would have made it 2-2 so the penalty decision really did kill us off.
"If it was a penalty then we wouldn't be able to say anything about it but it really was an error from the referee."
Mel was also disappointed with his side's defending which saw Palace go into half-time comfortably leading 2-0.
A goal from Thievy immediately after half-time salvaged a goal back for the Baggies, but the former Real Betis manager believes his side were left to rue a poor first half.
"I'm extremely angry," he said.
"In the first half we really did gift it to Crystal Palace, the first goal was from a second ball and the second goal came from a corner.
"I really would like to know [why we started so slowly] but if we had played like we did in the second half we would have three more points right now."