The Scot signed a new contract in the summer after interest from Reading but poor results this season, including a 2-1 home defeat by Nottingham Forest at the start of October have led to his departure.
The Reds meanwhile are trialling a new scheme whereby fans of both Forest and Doncaster Rovers can buy family stand tickets for the City Ground game on 29 November.
Safety officer Alan Bexon said: "It's something we have been considering for some time.
"We sincerely hope the idea will catch on and lead to us eventually getting back to a situation where there is no need to segregate fans.
"Football has evolved since the days when hooliganism was at a peak and we believe the initiative could be a step in a very positive direction."