Reports in Portugal claim that Louis van Gaal's side are in negotiations over a deal for the 22-year-old defensive midfielderSporting director Augusto Ignacio admits the club are open to selling William Carvalho this summer.
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Goal reported in March that Manchester City were also considering a move for Carvalho, though their interest is likely to have cooled following the signing of Fernando from Porto.
"It's not like the old days when players left Sporting at any price," Ignacio told the Portuguese club’s TV channel.
"We are not concerned with William Carvalho because we have alternatives, who will want to play as well.
"The termination clause ensures a great deal to Sporting. I am very pleased with the negotiations.
"It is not easy to negotiate for players, you need to be very shrewd but Sporting have a president who knows how to negotiate with anyone and what is best for the club."