With Manchester United now unlikely to complete an expensive transfer for Edinson Cavani, a move for William Carvalho is seen as more likely.
United has opened the bidding for Carvalho at £25 million for a transfer from Sporting Lisbon.
Carvalho is seen as one of the best young holding midfielders.
United scouts have watched Carvalho 15 times this season.
Carvalho is also being pursued by Chelsea and Manchester City.