Calafiori revealed that he had been in discussions with Arteta and Arsenal's sporting director Edu for almost two months before a deal with Bologna was thrashed out.
"I spoke for almost two months with the coach and Edu. The negotiations were tough and took a while, but I was always convinced this was the right move for me," Calafiori said.
"I see Arsenal as the best project for me to develop as a player. There were other clubs but I don't care any more. I am here and I want to win trophies. This is the best project because the team is young and can win trophies. My mentality is to win. I can play in different positions, I don't care where but I just want to play. I was here in January to watch Arsenal versus Crystal Palace. As soon as I am really fit, I hope to help the team."