The loan deal for the 21-year-old was completed on Sunday.
“Fiorentina have always followed me, ever since I was playing for Coritiba,” Keirrison told the Corriere dello Sport newspaper.
“When my representatives told me there was a chance I could move to Fiorentina, I said yes right away because I wanted to join a club who had always appreciated me. It’s the best choice for me.”
