Andre Onana warns Harry Maguire 'to be ready' after Man United's new £47m keeper berated the defender for giving away the ball during disappointing friendly defeat by Borussia Dortmund

Andre Onana has warned Harry Maguire to stay focused at all times after the former Red Devils skipper nearly cost his side a goal with some sloppy defending during Manchester United's 3-2 loss to Borussia Dortmund on Monday.

47 minutes into the game, the Cameroonian shot-stopper gave his defender an earful for giving away possession and allowing Dortmund's attackers in on goal.

Onana managed to get a hand to Sebastien Haller's effort before Karim Adeyemi fired the follow-up wide.

Once the ball went out of play, the former Inter Milan keeper sprinted over to Maguire and berated him for the mistake.