Bayern Munich are considering letting Sadio Mane leave the club when the season concludes.
The Senegal winger has not enjoyed the spell at Bayern that he was hoping to experience when he signed last summer from Liverpool.
Mane has looked a shadow of his former self, with the 31-year-old failing to live up to his hype as the replacement for Robert Lewandowski.
After signing in a £35 million deal, Mane has not scored enough goals and has issues with his teammates.
Per Bild, a big enough offer would convince Bayern to part with Mane and rebuild their front line.
The source adds that Chelsea may be looking to bring him back to England.