Virgil van Dijk suffered a serious injury in a collision with Jordan Pickford during Liverpool and Everton's 2-2 Merseyside derby draw on Saturday and the Reds have now revealed just how bad it is.
The club have confirmed that the centre-back will have to go for surgery.
While they did report on the extent of the injury, the club couldn't offer a timeframe for his return.
"Liverpool can confirm Virgil van Dijk will undergo surgery on the knee injury he sustained during Saturday's 2-2 draw at Everton," a club statement started.
"The centre-back damaged knee ligaments following an incident involving Blues goalkeeper Jordan Pickford after six minutes at Goodison Park.
"Van Dijk was required to be substituted and further assessment on the injury has revealed an operation will be needed.
"No specific timescale is being placed upon his return to action at this stage.
"Following surgery, Van Dijk will begin a rehabilitation programme with the club's medical team to enable him to reach full fitness as soon as possible."