Arsenal beat London rivals Chelsea 4-0 in a pre-season friendly on Saturday.
Gabriel Jesus, who joined from Manchester City this summer, gave the Gunners the lead followed by goals from Martin Odegaard, Bukayo Saka and Albert Sambi Lokonga.
Reacting to the crushing defeat, Blues boss Thomas Tuchel told reporters: “I saw a team in Arsenal who are mentally committed to a level of exhaustion.
“That we could not match physically and mentally because we have a lot of players who are thinking about leaving and looking at their options.”
Chelsea are in a tumultuous phase after Todd Boehly’s takeover, with several key players keen on leaving. Influential chiefs like Petr Cech and Marina Granovskaia have also departed.