The news follows the revelation that Ken McGeoch, a long-standing club director, is preparing a takeover bid to rival the community-based proposal that is close to completion, but has been unable to get over the finishing line in recent months.
The Paisley club has been on the market since September, 2009, when a consortium of directors, led by chairman Stewart Gilmour, put their 52% shareholding up for sale.
A community takeover, in which members would pay for a direct say in how the club is run, is said to be "99% of the way there", but the proposal has stalled in recent times.
That has prompted a rival bid led by McGeoch, one of the St Mirren directors not involved in the selling consortium.
Now it appears a third group, alerted to the clubs's availability by news of McGeoch's interest, is weighing up a move. "There's been a note of interest [from McGeoch] but there has been no formal offer so far," said Gilmour. "Any offer we receive will be considered."
The community plan, meanwhile, led by Richard Atkinson – an Ayrshire businessman now also on the St Mirren board – has been gathering momentum for the past 18 months or so.
A community-interest company (CIC), 10000 Hours, has been created to source loan funding that would provide the £2million required to buy out the consortium, with monthly contributions from supporters, as well as local businesses and organisations, then used to pay back what has been borrowed.
It has seemed close to completion for several months now but still awaits the final sign-off, much to Atkinson's frustration.
"We are unfortunately in the same position as we were at a recent members' meeting, in that we are waiting for one final piece of the overall package to come together," he said.
"This final issue is unfortunately outwith our control, but it has nothing to do with either the CIC, the selling consortium or the organisations which are funding the CIC.
"We are 99% of the way there but until we are at 100% we cannot move on and complete the purchase."
On Saturday it emerged that McGeoch, a St Mirren director for the past 15 years, and Paul Davies, who was involved in an unsuccessful attempt to buy Gretna three years ago, were weighing up a £2m bid.
This would take the form of a more traditional takeover, with the pair backed financially by other would-be investors. It looks like a third party could offer a further alternative.
St Mirren have been drawing interest on the pitch, too, with their more expansive style of play receiving plaudits.
But it has failed to garner any goals in their last three home matches – the Paisley side drew 0-0 with St Johnstone on Saturday – though Danny Lennon believes that is down to visiting teams paying his players greater respect.
"We feel teams are coming and trying to frustrate us at home by sitting in," said the St Mirren manager. "So what we've got to do is come up with a cutting edge and creativity and we'll do that. It's up to us to take it to the next level.
"I've no doubt goals will come. The way the lads have been asked to play they've grasped it with both hands and we'll work to get that end product."