Mikel Arteta has now set Arsenal an imminent deadline to secure the transfer of Italy defender Riccardo Calafiori from Bologna with talks ongoing over the Euro 2024 gem. The Gunners manager is desperate to welcome Calafiori to Emirates Stadium this summer as Arsenal move to improve what was already the best defence in the Premier League. No club conceded fewer goals than the north London giants, who shipped just 29 through 38 games. Arteta was largely reliant on three players to lock down Arsenal’s defence, however. William Saliba played all 3,420 minutes on offer last season with Gabriel Maga…