Erling Haaland is a doubt for Manchester City’s FA Cup semi-final against Chelsea on Saturday (20 April).The Norwegian striker was surprisingly substituted prior to extra time of the Champions League quarter-final loss to Real Madrid on Wednesday.Pep Guardiola revealed after the game the 23-year-old asked to be withdrawn but did not give a reason why.Speaking on Friday, the Man City boss confirmed his forward had suffered an injury but still gave little indication as to how serious.