Enzo Maresca has revealed Cole Palmer was substituted in Chelsea's 2-1 defeat against Manchester United on Saturday due to a recurrence of the groin injury which has plagued his season. The 23-year-old had to be replaced just 20 minutes into the Blues' loss at Old Trafford, raising questions over whether the same issue which saw the forward miss his side's Premier League clashes with West Ham and Fulham had flared up.