The Premier League club sold Musiala to Bayern when he was only 16 and with their academy.
The attacker had wanted to move to Germany to go and live with his mother.
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Per The Mail, that deal was only completed after a sell-on fee worth 20 percent was included.
There is a suggestion that Premier League clubs may be ready to go on in for Musiala.
The forward, who plays for Germany, has not indicated any unhappiness at Bayern.