Premier League giants Manchester United and Chelsea are reportedly keeping track of Borussia Dortmund striker Robert Lewandowski.

Both clubs were linked with moves for the Poland international during the summer window, but the 25-year-old opted to see out his contract at Dortmund and is expected to leave the club at the end of the season.

The forward was heavily linked with a switch to Bundesliga rivals Bayern Munich following claims that he will sign a pre-contract agreement in January, but the player has dismissed such suggestions.

Due to the uncertainty of Lewandowski's future destination, Chelsea and United have made contact with the striker's agents declaring their interest in him, according to Goal.com.

Arsenal and Manchester City are also said to be monitoring Lewandowski's situation.