The Egypt international was forced off in the first half of the meeting with Real Madrid in Kiev as Liverpool fell short against the La Liga side.
He regained fitness to represent his country at the World Cup, scoring in each of the two games he played in, but the Pharaohs were eliminated in the group stage.
Salah returned to club duty on Friday for his first day of pre-season training before joining the rest of the squad on their trip to the United States.
Jürgen Klopp held a press conference shortly after the Reds’ arrival in Charlotte, where they face Borussia Dortmund on Sunday night, and was asked for an update on the No.