Thomas Tuchel advised not to use Kai Havertz out of his usual position.
The Chelsea midfielder joined the Blues in the summer of 2020 and has made 45 appearances for Chelsea across all competitions in the 2020/21 season.
The 22-year old playmaker is often used as a striker despite being an attacking midfielder and he scored the winning goal in the Champions League final.
Former German striker Klaus Fischer believes Havertz is not comfortable playing out of position.
He told Goal: “I saw him in the Champions League final against Manchester City and he played brilliantly.
“He is a young player who has a great left foot, but he’s not a real centre-forward, that’s clear to see.
“He certainly doesn’t feel comfortable there, but he’s a huge talent, he plays in one of the best teams in the world at Chelsea and he will continue to develop.”
Fischer added: “When you come to a different country and to a different team as a young player, you have to establish yourself.
“I think that he prevailed, seeing as he scored the deciding goal in the final in the Champions League and also because he has a German coach who teaches him the German virtues.
“He needs to demonstrate these virtues in England too, because they probably play the best football in terms of speed and physicality.
“I do believe that he has what it takes to assert himself because he can score goals.
“He’s also a smart player who knows how to play, but a young player who is not the finished article yet in his development.
“That goal [in the Champions League final] has probably given him an incredible boost and he will continue to score goals in England.”