Highly-rated Portuguese defender Daniel Carrico admits he is flattered by reported interest in him.
AC Milan, Atletico Madrid and Manchester City are all thought to be keeping a close check on the 21-year-old.
The Sporting Lisbon ace has become a regular in the first team this season and has had the scouts flocking to check on him.
City were first alerted to him during Mark Hughes' tenure, but the club have continued to monitor him under Roberto Mancini and remain keen.
Carrico currently has a number of years left on his current deal and has a buy-out clause of £18million, but reports claim Sporting would consider selling for £15million.
But Carrico himself insists he is not listening to the rumours surrounding him.
"I am happy with the rumours, but any decision does not lie with me," he told the Portuguese press.