Vermaelen says they won't be any finger pointing inside the locker room.
"At the moment there is a lot of disappointment because we lost," Vermaelen said.
"We didn't play disciplined enough as a team to win this game, especially in the first half. They were strong. It was difficult.
"Of course we are not happy. We are disappointed. We have to look at ourselves and stick together in difficult times.
"Don't look at each other, don't blame each other, work hard every day to get the results back."