Holland coach Ronald Koeman admits Davy Klaassen is frustrated at Everton.

Koeman signed the former Ajax captain last summer for Everton before his sacking.

"I called him a few weeks ago and spoke out of curiosity. He was in the picture again at Everton, but now again not. I do not know why. He had a difficult start at Everton, that was disappointing. But you cannot say that he does not train hard and works hard," said Koeman.

"Davy had trouble with the aggressiveness and the pace.

"You do not get time in midfield. I was disappointed with Davy. What did not help him is that we did not have a centre-forward. Romelu Lukaku left and the arrival of Olivier Giroud did not go through at the last moment.

"Nobody in the club had doubts about him. Not in the Netherlands either. Klaassen was someone we spent a lot of money for and who could have really played a role in midfield. In retrospect, you may have to doubt whether the step was not too big."