Arsenal made a "mistake" signing Kai Havertz, says William Gallas after the former Chelsea forward's struggles so far this season.
Eyebrows were raised when the Gunners splashed £65million on Havertz after an underwhelming spell across the capital at Stamford Bridge, but Mikel Arteta was determined to revamp his midfield after last season's remarkable title race collapse. He soon added Declan Rice and the Gunners sit joint-top of the league.