Borussia Dortmund star Jude Bellingham has come under some heavy criticism as he continues to be linked with a departure.
The England international is likely to be involved in a bidding war at the end of the season, with Dortmund seemingly resigned to losing their star midfielder.
Bellingham has been linked with Manchester United, Manchester City, Liverpool and Real Madrid over the last few months.
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However, former Reds midfielder Dietmar Hamann says the 19-year-old lacks discipline, which needs to change if he goes to a bigger club.
"What Bellingham doesn't have is discipline," Hamman told Sky Sports.
"He may want to return to the island [England] or Real Madrid. He has to play differently.
"At Dortmund he can do what he wants. Nobody dares to say anything.
"Because they're afraid of upsetting him. If you have that as a team-mate, you'll have a problem.
"If he doesn't do anything forwards and backwards, what does he do then?
"Obviously he is an exceptional player. But he has to get his discipline under control."