Arsenal has completed a $53.9 million transfer with Bologna for Riccardo Calafiori. Calafiori has signed a five-year contract and will wear No. 33 for the Gunners.

"It feels amazing -- it was tough until now, but finally we're here & I cannot wait to start to train with the team & play for the fans," Calafiori said of the move.

"I spoke a lot with the coach, with Edu & they convinced me, but I was already convinced by myself. I think it's the best project for myself for the next [few] years."

Calafiori mostly played center-back last season under Thiago Motta, but he can also play left-back, which gives Arsenal's strong backline even more versatility.