Luisao, a former Benfica captain and 15-year veteran of the club, was reacting to the Argentine's post explaining his side of last night's controversial clash with Real Madrid star Vincius Junior.
For Luisao, Prestianni's statement wasn't good enough and he declared on social media: "This shirt is very important, I love Benfica; it's my second skin, you have to be worthy to wear the sacred shirt, this text makes it worse because it's a lie...
"Football is won with grit, with a fighting spirit... He was racist, YES, and I'm ashamed of it."
He continued, responding to some fans: "I defend the club and I have experience, I know what I'm talking about. I'm not judging anyone. I'm just saying that Benfica is too big to get involved in this , whether it's true or not. Although, based on experience, I know the truth."