> “He can be one of the best in the world because the quality I see in training, his finishing with both feet and with the head. He is explosive, he is fast, he is strong in the air, so where are the limits? There are no limits,” he told reporters.
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> “But the numbers don’t reach the potential, it is as easy as that. He needs to push himself into goal involvements, that means goals and assist The limit for him is very, very high. Maybe higher than for others. He has the potential but potential is a dangerous word with high-level sports.
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> “You have to reach your personal best on a regular basis, that is what is demanded on this kind of level and that is the challenge for him. It’s not a question of talent, it’s a question of whether he can prove the point at club and international level. This is his task, whether he starts for us or comes off the bench he has to constantly prove himself.”