The midfielder – who provided the assist for Mohamed Salah’s opener in the Champions League league-phase win – picked up the issue during the first half and was unable to continue following the break.
Slot did confirm, however, the substitutions of Ryan Gravenberch and Dominik Szoboszlai were pre-planned, while the decision to take off Conor Bradley was purely precautionary.
He told his post-match press conference: “The idea was to take Dom and Ryan off at half-time, but Curtis unfortunately couldn’t continue, so that’s why Dom stayed [on] a bit longer.
“Conor, the idea was to play 90 but in the end you could see that it got tougher and tougher and tougher for him in terms of load, so you don’t want to take the risk of…