Simon Vukcevic's agent claims the Sporting Lisbon striker is wanted by three Premier League clubs.
The Montenegrin has been strongly linked with a move to Bolton Wanderers after impressing against the Trotters in last season's Uefa Cup.
He scored in a 1-1 draw at the Reebok Stadium and was rumoured to be a target for Bolton boss Gary Megson.
Vukcevic's agent Zoran Stojadinovic also says that Blackburn Rovers and Manchester City have shown an interest in a player who has called for his future to be clarified.
However, Stojadinovic has revealed that Sporting are not looking to sell the forward as he is a key part of the club's plans.
"Bolton, Blackburn Rovers and Manchester City have wanted talks in the last few weeks, but Sporting have rejected the offers on a sporting basis," Stojadinovic told O Jogo.
"The directors have told me that Vukcevic is a key man for coach Paulo Bento.
"We do not wish for more rumours and speculation. Now, the player just wants calm to concentrate on his work and to play as much as possible for the team."