Internacional president Giovanni Luigi insists the club will not let Leandro Damiao leave unless his buyout clause is met amid rumours linking him with a move to Manchester United.
The Brazil international striker was heavily tipped for a switch to Tottenham during the summer transfer window but Internacional have claimed they turned down an offer from the White Hart Lane club because it did not match their valuation.
Luigi has previously revealed the youngster has a €60million (£47million) buyout clause in his deal at Inter, where he is contracted until 2016.
It is also believed Damiao was offered to Liverpool on loan but the deal was considered too expensive by the Merseysiders.
Speculation has now surfaced that United are targeting a January swoop for the 23-year-old, who starred for his country at the Olympics, finishing the tournament as top scorer with six goals.
Luigi says Internacional will stand firm on their valuation if United do come knocking and is adamant the Premier League giants must speak directly to the Brazilian club.
He told Zero Hora: "We aren't talking about a small team. We are talking about Internacional. They (Manchester United) have to talk with Internacional, not with the player.
"If Manchester United came here today, I would ask them to pay his buyout fee. They have to know that Internacional are a big club.
"Now, Leandro Damiao only leaves if the buyout fee is paid."