Aberdeen's interim head coach Peter Leven will miss Saturday's game against St Johnstone after undergoing an "emergency procedure."
The club announced that the 40-year-old was taken to the hospital on Friday evening.
In his absence, Scott Anderson will lead the team, supported by coaches Craig Samson, Jonny Hayes, and Stuart Duff.
Leven, who attended a press conference Friday morning, has taken on the interim role twice this season, first after Barry Robson's dismissal and then again following Neil Warnock's departure.
For Aberdeen, a win on Saturday could eliminate any concerns about a potential relegation play-off.
Meanwhile, St Johnstone, who have yet to lose against Aberdeen in three meetings this season, are just one point ahead of 11th-placed Ross County.