Borussia Dortmund chief Hans Watzke can understand the frustrations of Kevin Grosskreutz.

The winger, who has talked up the prospect of joining Liverpool or Manchester United this season, hit out at the lack of playing chances he's had last week.

"The fact that he is thinking about leaving is legitimate. But he has contract until 2014 and we want to keep him in any case," said the BVB boss, "each player needs to learn that we now have more games and not every player can play every game or be in the starting lineup."