Arsenal and Juventus have been warned against moving for VfL Wolfsburg striker Julian Draxler.
He was booed off the pitch by his own fans after Saturday's 3-2 home defeat to Hertha Berlin.
Gunners target Draxler, 23, has annoyed supporters by saying he wants to leave Wolfsburg.
German legend Lothar Matthaus said: “As a big club, I would not want Draxler at the moment.
“On the one hand, because of his weakness in character, on the other hand, since he is a talent but has not yet proved permanently to make a difference at a high level."