The 14-day waiting period could be waived if all clubs give their consent.
However, the chairman continued: "If all clubs agree to short notice then it can be less. All have to agree to it and it won't happen."
The package of reform recommended by an SPL steering group also included a second tier of 10 teams, an earlier start to the season and the return of a winter break.
And Doncaster hopes that the changes will be introduced for the season after next.
All of the top flight clubs met at Hampden on 4 January to discuss the proposals, with SPL chairman Ralph Topping describing the talks as 'positive' and representatives of Aberdeen and St Johnstone suggesting there was a willingness to embrace the 10-10 set-up.
But, with four clubs - Dundee United, Hearts, Inverness Caledonian Thistle and Kilmarnock now known to be against the changes and St Mirren saying their preference is for a 14-team top league, top flight chairmen are braced for further talks on possible reconstruction.
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