Liverpool have announced Alexander Isak fractured his ankle during Saturday's victory over Tottenham and has undergone surgery.
The striker was hurt in a challenge from Micky van de Ven in the act of scoring the opening goal in the 2-1 victory and limped off the pitch.
A statement on liverpoolfc.com read: "After diagnosis, an operation was completed today on an ankle injury that included a fibula fracture.
"Isak’s rehabilitation will now continue at the AXA Training Centre, with no timeframe yet placed on his return."
Isak, who had been on for only 11 minutes after coming on as a half-time substitute, left the pitch looking in considerable distress.
Immediately after the game head coach Arne Slot admitted the injury was "not a good thing".
"If a player doesn't even try to come back, that is usually not a good thing but I cannot say anything more than that.
"That is just gut feeling and nothing medical...let's not be too negative yet. We don't know yet. Let's hope he is back with us soon."
The noise around Slot’s position increased dramatically during a terrible November with a 4-1 home loss to PSV particularly painful.
However, Liverpool have seemingly emerged stronger with three consecutive wins in an unbeaten run of six matches to move back into the top-four picture.
Slot added: "Of course we’re happy with that but when we started the season, it wasn’t as if I was thrilled and completely happy when we were top-four.
"We’re always aiming for the best possible and after the very good start we had, we were disappointed with the run of results we had afterwards, but we are now on equal points for top-four.
"I think it has never been as bad as people said, but it’s also true that we are definitely not perfect yet. We knew this and when we made so many changes in the summer, that it would take time."
Spurs boss Thomas Frank is the current Premier League boss under the microscope and this latest home loss made it five defeats in eight matches.
Tottenham are seven points off Liverpool and will be without Xavi Simons for three matches after his first-half red card.
Captain Cristian Romero will also sit out the trip to Crystal Palace on December 28 following his sending-off, but Frank vented his frustration at Xavi’s punishment after his tackle on Virgil van Dijk.
"Yeah, that’s of course disappointing," Frank reflected.
"If it was intentional or a very stupid tackle, which I don’t think it is, then it’s one thing.
"So, I just think it’s too harsh a tackle like that can be three games.
"One game? OK, that’s one thing, but three games? Of course, is too much."
Xavi added: "Mistakes happen. Virg is my captain, I would never intentionally hurt him or anyone. To my Spurs team-mates, my manager and the fans, I take responsibility. I’m really sorry."
