Olympiakos manager was unhappy from Olympiakos performance after the 1-1 draw in the cup game against AEK.
Pereira admitted that his players raised the tempo after the interval but they did not manage to be as good as they have been recently.
“We were not good enough in the first half but after the break we improved a lot but we were not at our best. AEK are a strong and good team. We are not happy from our display. We know that the second leg will be tricky and we have to be much better in order to go through,” Pereira said.