Manchester United may have to pay Borussia Dortmund AND Bayern Munich to sign Robert Lewandowski this summer. The Daily Star says United could have to stump up extra cash to persuade Bayern to rip up their agreement with the striker.

Sources in Germany believe that a complicated deal could be required to capture the forward.

United would first have to pay European champions Bayern a compensation fee. Then they would have to negotiate a deal with Dortmund.

Dortmund want £25.5m for Lewandowski, even though he has just one year left on his contract.