"Sometimes you have the feeling with Leroy's body language that it's all the same, whether we win or lose. He has to improve his body language," Real Madrid midfielder Kroos told reporters.
"He's a player who has everything you need to be a world-class player but sometimes you have to tell him he has to perform better."
Sane scored 10 goals in 32 league appearances last season as City cruised to the title but he has not been able to force his way into Pep Guardiola's starting side in this campaign.
Sane was left out of the squad for Saturday's 2-1 victory over Newcastle United but Guardiola denied reports that the German's omission was due to an attitude issue.
"What is crystal clear is Sane's quality, his pace, his left foot. He was fantastic for City last year but Pep has the same problem at the moment -- he's trying to get the best out of him," Kroos added.
"If he performs, he's a real weapon."
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by John O'Brien)
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