Guinean midfielder Naby Keita will miss Liverpool’s Premier League game against Southampton on Saturday at St. Mary’s Stadium.
Keita also missed the European champions’ UEFA Super Cup victory against Chelsea on Wednesday in Istanbul due to a muscle strain.
Keita pulled out of a training session early at Besiktas Park on Tuesday after feeling the problem.
“It’s a muscle thing and we don’t know exactly how long it will take. But he’s not available,” manager Jürgen Klopp said.
Liverpool said that the injury will be examined further by the medical team in the coming days.
Liverpool is third in the league following a 4-1 win at home against Norwich on the opening day while Southampton is 17th after losing 3-0 away to Burnley.