Hearts will immediate start their search for a successor. We take a look at some of the names likely to be mentioned over the coming days and (potentially) weeks.
5. Steven Naismith
He acts like a manager on the pitch, could he be one from the dugout? The forward's injury-blighted start to his four-year contract might have the board considering an early push into management. Photo: SNS
6. Tommy Wright
The St Johnstone boss has been continually talked up as one of the better managers in the league but has yet to move to a bigger club. Could this be the time? Photo: SNS
7. Robbie Neilson
The former Hearts head coach successfully guided the club to a Championship title and then third place in the top flight in his two seasons in charge. Would the board be interested in bringing him back? Photo: SNS
8. Michael O'Neill
Northern Ireland manager Michael O'Neill has been a rumoured target in the past, most likely due to his residence in Edinburgh. His bumper contract with the Irish FA would probably make any move unlikely. Photo: SNS