Kilmarnock defender Frazer Wright will miss the rest of the season with a shoulder injury, according to caretaker manager Kenny Shiels.
The 31-year-old picked up the problem in the 0-0 draw with St Johnstone.
Wright, who joined the Ayrshire club in 2005, has been a regular starter in the Killie first-team and has already made 31 appearances this season.
However, he was withdrawn after 85 minutes of Saturday's match in Perth after colliding with Danny Invincibile.
Wright was left holding his right shoulder in the penalty box after the clash with the Australian striker who recently left Rugby Park for St Johnstone.
Kilmarnock lost manager Mixu Paatelainen last week, with the former Finland international taking over as his country's national coach.
Shiels is now in interim charge and made his first signing on Thursday, with Ryan O'Leary returning to Rugby Park after his five-year spell at Rugby Park ended in the summer following a spell on loan to Dundee.
Now, instead of simply adding to Shiel's options, the former Scotland Under-21 international could be thrust into the first team earlier than expected.