AC Milan have confirmed that centre-back Simon Kjaer will miss the remainder of the season after undergoing surgery on his ACL.
The Dane, who finished 18th in the recent Ballon d'Or rankings, managed just four minutes against Genoa on Wednesday before suffering the injury, which unfortunately required surgery to repair.
Kjaer went under the knife on Wednesday, after which Milan took to their official website to confirm that the centre-back's season is over.
"AC Milan announces that today Simon Kjaer underwent arthroscopy of the left knee for the reconstruction of the anterior cruciate ligament and the re-insertion of the medial collateral ligament," a statement read.
"The operation, carried out at the La Maddonina Clinic, was perfectly successful and was performed by Dr. Roberto Pozzoni, with the contribution of the Galeazzi CTS (Sports Traumatology Centre) team in the presence of the club's health manager, Stefano Mazzoni.
"Kjaer is well and is motivated to start the rehabilitation process immediately. Recovery time is estimated at six months."
Losing Kjaer comes as a massive blow to Milan, who sit just one point behind Napoli at the top of the Serie A table.
The 32-year-old started ten league games and an extra three in the Champions League, playing a vital role for Milan when fit and helping the Rossoneri keep pace with Napoli, who have been struck down by an injury plague of their own - Victor Osimhen, Andre-Franck Zambo Anguissa and Kalidou Koulibaly are all currently sidelined.
In Kjaer's place, team captain Alessio Romagnoli will return to the team after serving a one-game suspension and will almost certainly take a regular spot alongside Englishman Fikayo Tomori.
Young Matteo Gabbia is the only other centre-back in the squad, meaning manager Stefano Pioli may be keen to find short-term reinforcements once the January transfer window opens.