Ballack wants Havertz to be more aggressive.
has talked aboutKai Havertz
, saying that the young star must be more aggressive and face the challenges.
"It is important for Chelsea to understand that if you buy a player with that kind of potential, then you have to give him time, bit by bit,"
Ballack told Stats Perform News
"So he can be in that role and that the team can be built around him.
"At the moment there are too many players that fight for many positions. There are only a few players that are so to speak 'untouchable'.
"Therefore he now faces a normal competitive scenario. It just depends on him, if he is able to win it.
"He needs that will, but if he sees it and takes on the fight then he will be able to get that spot as he has exceptional football qualities.
"However it is a different level than at Leverkusen. Therefore he has to live with it."
"Timo started off pretty well. Of course, if you aren't scoring as a striker, then it is hard on the self-confidence,
"I believe, that it is very hard for him overall, as he was used to playing differently at Leipzig.
"He had a lot more space in front of him. Chelsea is the kind of team that has a lot of ball possession, wanting to dominate the opponent. Maybe even more so with Tuchel."