Kilmarnock were expected to name former Blackpool manager Lee Clark as their new boss on Monday morning
The Rugby Park club released a statement on Sunday night announcing that their hunt for Gary Locke's replacement was over, saying the new man would be presented at 10am on Monday.
Former Huddersfield, Birmingham and Blackpool manager Clark has been widely reported as Killie's chosen man.
Lee McCulloch has coached the side since Locke was sacked, winning at Motherwell on Saturday after earning a Scottish Cup replay with Rangers.
That replay, on Tuesday, will be the new manager's first game in charge.
McCulloch, who is being retained as an assistant, said: "I believe the board has made a fantastic appointment having taken time to interview a number of strong candidates and I look forward to introducing him to the media tomorrow.
"With everyone pulling together, I'm confident that the new manager will lead the team to success. On a personal note, I have thoroughly enjoyed being interim manager and thank the board, staff, players and fans for their support and encouragement."
Clark, 43, most recently managed Blackpool where he won three of 33 games in charge, although he had considerably more success in his first job at Huddersfield where he won 87 of 178 games at the helm.
Kilmarnock sit 10th in the Scottish Premiership, a point above second-bottom Motherwell.