The Dutch defender has been linked with a move away this summer.
But after victory over Manchester City, he says: "It was a great team performance. It is hard to say who was our best player, everybody played well. The way I see it now is that we have to play nine finals. Before this match, I told myself we had 10 finals, and now we have nine left.
"I want to go and play with Everton in Europe. We have nine finals, and we must see it game by game. The squad is really strong, and the focus must only be on the next game."