Borussia Dortmund striker Robert Lewandowski is set to sign with Manchester United.BILD says Lewandowski is set to accept an offer of £20.5million in wages from Manchester United to join the club in the summer.

Borussia Dortmund have reportedly agreed an £18million bid for the Polish striker, who has long been pursued by Sir Alex Ferguson.

The 24-year-old will sign a five-year contract at Old Trafford worth around £4.1m annually.

The striker's contract with the club expires at the end of next season, and it is believed he will double his wages with a move to the Premier League.