Sporting Lisbon chairman Bruno De Carvalho won't rule out cashing in on William Carvalho. The Portugal is a top target for Manchester United and is also being linked with Chelsea.
De Carvalho said: "We haven't received any formal or informal proposals for any of our players.
"Is a sale possible? Nothing is impossible in football."
United have shown they are willing to splash the cash this summer, having already spent just under £60m on Luke Shaw and Ander Herrera.
