Leeds United forward Ross McCormack has been ruled out for two months with an ankle injury.
The Scotland international, 26, picked up the injury in the opening minutes of Saturday's defeat at Cardiff and will not be available until mid-November.
Boss Neil Warnock told the club website: "It might be that he needs an operation because he's chipped a bone alongside the ligaments.
"It's as bad a twisted ankle as you can get without breaking it."
The injury means he will miss Scotland's World Cup qualifiers against Wales and Belgium in October.