Manchester City have made a mistake in selling Gabriel Jesus to Arsenal, according to former player Dietmar Hamann.
The 25-year-old Brazilian made the £45million switch from City to the Gunners earlier this week and has completed his medical at the Emirates.
He is expected to put pen to paper on a five-year contract at Arsenal, as he looks to get regular starting time after failing to hold down a starting spot under Pep Guardiola.
But Hamann has warned that losing Jesus could be very costly for Guardiola and City, given the chequered fitness history of new arrival Erling Haaland.