Partick Thistle have joined forces with Hearts to launch a legal challenge to their relegation after a donor offered to fund their court battle.
Both clubs and Stranraer were consigned to the drop on Monday when the latest and last attempt to reconfigure the Scottish leagues failed.
While Hearts immediately launched legal action, Thistle baulked at both the cost and risk involved and vowed to focus on building a squad to go right back up to the Scottish Championship.
But the Scottish Professional Football League now face the prospect of defending their decisions in court against two member clubs.
Thistle chairman Jacqui Low said in a statement: "Yesterday, we said that court action was our preferred route to challenging our relegation to League One.
"It was only a lack of funding that stopped us. At that time, we reserved the right to change our position should circumstances change.
"Last night, in response to our statement, we received a proposal to fully fund legal action should we wish to pursue it, at no cost to Thistle.
"After careful board consideration, we have now accepted this extremely generous offer of unexpected help.
"Today, following discussions with Hearts, we have agreed that we will launch a joint legal challenge to resolve what others have failed to do since April."