Sky Deutschland says Chelsea are considering offloading Werner - and may use the German to tempt Erling Haaland to the club.
The 25-year-old, who joined the Blues from RB Leipzig last July for £47.5million, managed just six goals in 35 Premier League games and wasted a hatful of gilt-edged chances during his debut campaign in England.
Despite still having four years left to run on his contract, the west London club are reportedly keen to cash in on Werner this summer and have reportedly sounded out the possibility of swapping him for Haaland.
Chelsea are said to accept that any offer to Borussia Dortmund to get arguably world football's hottest young talent would require a player plus cash offer and may need to pay him more than top earner N'Golo Kante, who earns £290,000 a week.
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