The Italy global has a clause in his contract, which runs until 2021, that means he would be allowed to leave Torino if a club outside Italy offered €100 million.
Cairo said that would be the only way in which Belotti, who scored 26 goals in Serie A last season, would sign for United this summer.
Andrea Belotti has been rumored to be one of Milan's main targets this summer and it looks like that rumour is now truth - Milan have made an opening offer for the star forward of Torino.
"I'm not thinking about selling Belotti". Even the club President has said they intend to keep Andrea Belotti till next season as they just recently renewed his contract.
Madrid apparently want a whopping £78m for Morata, while the release clause on Belotti's contract with Torino is an astronomical £100m, but it would be a surprise if the Italians were really expecting to sell for that much.
"If someone brings the €100m then I would have to let him go".
But by the end of August you sense that, actually, such a sum will align with the general pattern of splashes made by big clubs.
However, he did accept that he would be obliged to sell the 23-year-old if United or any other non-Italian club matched his buy-out.