Pereira was unimpressed by the striker's decision to go straight down the players' tunnel at the final whistle, rather than acknowledge the away support.
The Wolves boss said: "He's a captain. He can be frustrated as he wants to win, but everyone in the dressing room wants to win. I don't like his body language.
"I want a captain to try to help the team with running, suffering and fighting together. But I understand it now - next time I won't understand."
On the 3-1 defeat, Pereira also said: "We need to be consistent for 95 minutes. Today the team tried to do their best but not in the way that we should.
"We need to improve set-pieces for sure. We need to improve the moments that we must have confidence to switch the play, switch the ball. We need to improve our tactical maturity."