Liverpool manager Arne Slot says the club are looking into goalkeeper Alisson Becker's injury issues.
The Brazil international suffered a hamstring injury in a win at Crystal Palace on 5 October and is expected to be sidelined until at least the next international break, in mid-November.
Alisson has already missed two games this season through injury and was out for just over two months from February to April last season.
"It’s a bit uncommon for goalkeepers," said Slot. "For me, it’s common because the goalkeeper I had at Feyenoord [Justin Bijlow] also had his issues with injury, also muscle injuries.