Roberto Firmino will play no part in Liverpool’s second leg Champions League clash against Barcelona at Anfield
Salah was stretchered off with a head injury against Newcastle, while Roberto Firmino has been confirmed out of the tie at Anfield.
The 26-year-old Egyptian laid motionless on the ground for several minutes before moving and talking to Liverpool medical staff, and was then taken off the field in the 73rd minute.
After the Reds returned to the top of the Premier League, with Manchester City still to play on Monday Night Football, Klopp said: “He (Salah) got the hip of the goalkeeper on his head.
“He was on the ground, the doctor had to make the decision and that was to take him off. We accepted that, of course.
“He was sitting in the dressing room watching the game, so he was then fine, but, of course, we have to wait because he got a proper knock in that situation.”
Strike-partner Firmino, who started on the bench for the 3-0 first-leg defeat at the Nou Camp on Wednesday, had been replaced in the starting line-up at Newcastle by Daniel Sturridge.
Ahead of kick-off, Klopp admitted to Sky Sports that it was “not really likely” that the Brazilian will make the second leg next week – and at full-time he confirmed “he will not be ready for Tuesday and the rest of the season”.