Salah, Liverpool's leading scorer in all competitions this season, sustained a head injury in the Reds' 3-2 victory over Newcastle United on Saturday.
The Egypt forward had to be taken off on a stretcher in the 73rd minute, with his replacement Divock Origi scoring the winner 13 minutes later.
Speaking ahead of Barca's trip to Anfield, Klopp confirmed Salah had suffered a concussion but will be fit for Sunday's decisive final-day Premier League clash against Wolves.