Richard Keogh injured his knee in a car crash on Tuesday night which resulted in teammates Tom Lawrence and Mason Bennett charged with dring driving.
The Telegraph reports that the Ireland international was in the back seat of Tom Lawrence's Ranger Rover when it hit a lamp post. Keogh subsequently went for a scan on the injuries.
The club confirmed on Thursday afternoon that Keogh suffered a "serious knee injury" which will keep him out of action until the end of the season.
Derby also condemned the behaviour of the players involved, including Keogh: "The players were out as part of a scheduled team-building dinner with staff and while the majority of them acted responsibly and left at around 8pm and were not involved, a small group, including the team captain Richard Keogh, continued drinking into the night. They should have known when to stop and also ignored the opportunity to be driven home using cars laid on by the club, and chose to stay out. As a result of an alcohol-related incident, Richard Keogh has sustained a serious knee injury that will prevent him from playing until the end of the season."
In a statement, Derbyshire Police confirmed the charge against Bennett and Lawrence.
Two men have been charged with drink driving after a collision involving a Range Rover Sport and a Mercedes GLC at the junction of Burley Hill and the A6 at Allestree, last night shortly before midnight (Tuesday, 24 September).
Mason Bennett, 23, of Whaley Thorns near Mansfield and Tom Lawrence, 25, of Duffield were arrested at the scene and charged earlier today. They are due to appear at Southern Derbyshire Magistrates Court on Tuesday, 15 October at 9.30am.
With Ireland due to play Switzerland and Georgia in Euro 2020 qualifiers next month, the news of Keogh's injury will be unwelcome for Mick McCarthy.
In addition, Shane Duffy limped of during Brighton's defeat to Aston Villa in the League Cup with a calf injury which manager Graham Potter said is a "concern".
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