Former Germany star Gunter Netzer believes Mario Gotze has made no progress since joining Bayern Munich from Borussia Dortmund in 2013.
Gotze, 24, controversially left Dortmund to join their Bundesliga rivals Bayern for a reported €37m fee, but has failed to justify his price tag over the past three seasons.
The midfielder has since been linked with a summer move away from Bayern, with a return to Dortmund or a switch to either Liverpool or Juventus all mooted as possible destinations.
And Netzer believes Gotze has struggled at Bayern to the point where he believes Germany's 2014 World Cup hero needs to “prove himself all over again."
"I get the feeling that he is still looking for his former self. He has not developed at all at Bayern. He never really lived up to the expectations at Bayern," Netzer told Sport Bild.
"It depends on his personality whether he should leave Bayern. It is not an easy step. Should he stay in Germany or move abroad? A move abroad has done a lot of players good, especially those who have a point to prove.
"[Former Bayern coach] Pep Guardiola once said Gotze is the best player he has trained after Lionel Messi, and I can understand that comment. Mario has some incredible skills.
"But they are of no use when you are not showing it on the pitch. He has to prove himself all over again."
Gotze has a contract with Bayern until June 2017.
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- Goal