Roy Keane said Manchester United's 3-2 defeat to Arsenal at the Emirates on Sunday was a 'reality check' for Erik ten Hag's men after their recent run of good form.
Eddie Nketiah struck twice, including in the 90th minute, to help the Gunners win the vital clash at the top of the Premier League table, after Marcus Rashford and Lisandro Martinez had both scored for Man United.
Speaking to Sky Sports in the aftermath of the crazy game at Arsenal, Keane, a former captain at Man United, said it would have to be a learning curve for the squad after their rise this season.