Fabio Coentrao's Monaco career is all but over after the Ligue 1 cub confirmed that the Real Madrid loanee will be sidelined for between three to six months.
The Portugal international sustained a thigh injury in training last week and was not considered for the trip to Lille on Sunday, which ended in a 4-1 defeat for Leonardo Jardim's side.
Subsequent scans have revealed the extent of the damage, and Coentrao will undergo surgery next week, meaning his season is over as the 28-year-old left-back is expected to return to Los Blancos at the end of the current campaign.
The Rio Ave youth product has endured a frustrating loan spell at Stade Louis II, with much of his time spent on the treatment table due to various injuries that have restricted him to just 22 appearances in all competitions for Les Rouges et Blancs.
Coentrao will also miss Euro 2016, although he featured in just four of his country's qualifying matches and hasn't played for the national team since their 1-0 win over Denmark in October last year.
A statement on the club's official website read: "Fabio Coentrao suffered an injury to his right thigh in training last week.
"He is due to undergo surgery in Finland next week by Dr Sakari Orava, and is expected to be out for between three and six months."