Mikel Arteta warned that this Arsenal squad is his strongest since taking charge almost six years ago.
The Gunners have spent around £190million on six players — with their total set to reach £250m from the signing of Eberechi Eze.
The Crystal Palace star had his medical yesterday after Arsenal hijacked the transfer from rivals Tottenham on Wednesday night.
The 27-year-old was in line to join Spurs after agreeing terms with the club, before Arsenal swooped in. That was just hours after Havertz missed an open training session because of a knee injury he picked up against Manchester United on Sunday.