The SPFL board will not overrule any decision on whether to restructure Scottish football for next season according to their chief executive Neil Robertson.
A deadline of Monday has been set for clubs to indicate whether they support a Hearts' driven proposal of a 14 team Premiership, with three divisions of 10 below that.
Doncaster says his organisation must work to implement whatever their members vote for next week.
"It's up to any club to bring forward a proposal at any time, and various clubs have put forward proposals, both related to reconstruction and other issues," the SPFL chief told Sky Sports.
"Ultimately, if they have support from members, then it's important that's voted through.
"We are taking the lead. We've gone out to clubs with a specific structure. We've asked them to indicate whether they would support that structure. If sufficient numbers do, then we'll come back with a resolution.
"What became clear from the first stage of consultation was that a temporary fix was not going to gain sufficient approval. There was some sympathy for the idea of an expanded Premiership, and that's the basis on which we've gone back to clubs.
"We're asking them a very specific question: would you support a 14-10-10-10 structure? If sufficient clubs indicate over the weekend that they are supportive, then that's what we'll bring forward."
