Cagliari president Massimo Cellino has explained selling Radja Nainggolan to AS Roma.
Cellino admits more players could be sold this month.
He said: "If tomorrow I was asked about Astori or others, I would let them go. I cannot protect my boys and so I could give them all away, as was the case for Nainggolan.
"Radja was wanted by PSG and Manchester City, but I succumbed to Roma. He did not want to leave, he had to.
"Zenit were willing to pay 25m last summer, Juventus offered 20m and were prepared to let me have him until the end of the season, like with [Fabian] O'Neill.
"And Radja, the next day, came home and extended his contract. But he could not stay here. How can he grow in a team with no ambition?
"He has gone to Roma, on a loan of 3m. There he will grow with champions like Totti and De Rossi, a good Coach and a club that already loves him.
"If I had pocketed 20m, what would we have done?"
