Manchester United are eyeing Fulham midfielder Joao Palhinha.
United, Newcastle, Liverpool, Chelsea, Arsenal and Tottenham are all monitoring the Portuguese, says The Sun.
But boss Marco Silva is determined to resist bids for the star.
Fulham paid an initial 17million to sign Palhinha from Sporting Lisbon last year but his performances so far in this campaign will have more than doubled his value to 40m-plus.
He has made more tackles than any midfielder in the big five leagues in Europe and has been the heartbeat of Silva's side as they chase qualification for Uefa competition next season.
Palhinha's price tag is also pushed up by the fact that he still has more than four years left on his contract, with the club holding another year's option.