Wenger accused Mancini of breaking the 'basic rules of football' after the Italian appeared to admit hoped to sign the Gunners star by the end of the month.
But Mancini was surprised by Wenger's outburst and insisted he had said little to anger the Frenchman.
"I said only that Nasri, (Sergio) Aguero are two good players and I said also that Nasri is under contract with Arsenal," he said. "I don't know why he's upset, but only this.
"Because the question was about some good players, I say that like this. I said also that Nasri is under contract with Arsenal, it's difficult. Only this."