Graham Potter defined the reasoning behind the midfielder’s early exit on Wednesday night time after it appeared he had suffered a knee damage.The ball cannoned off Gallagher’s leg whereas it was planted on the turf shortly earlier than his Sixteenth-minute substitution, elevating issues earlier than the Chelsea supervisor calmed these fears after the full-time whistle.Potter informed reporters: “I have never spoken to the medical doctors however he simply felt ailing. He felt like he was going to be sick. “You possibly can most likely see that in his first quarter-hour, he wasn’t fairly himself so hopefully it is only a 24-hour factor and he will likely be okay.Learn Extra“Clearly that most likely affected him and us slightly bit however hopefully he recovers shortly.”Chelsea had been held to a 0-0 draw at Gtech Neighborhood Stadium in an entertaining west London derby that Potter took the positives from.He added: “The positives are a clear sheet and a degree. That is 4 factors from two away matches which is constructive. “After we did management it we did it fairly effectively but it surely’s a degree and we have now to maneuver on.”