Ayr United chairman Lachlan Cameron tonight branded the idea of a 14 team Scottish Premiership "insane" as he pledged to vote against any such move.
The Somerset Park chief fired a warning shot as the stage was set for talks on SPFL reconstruction.
It follows Dundee's long-awaited vote earlier today that signalled the early end of the lower league seasons.
Crunch negotiations are now set to take place on the future setup of the game.
But Ayr owner Cameron is furious at the prospect of an expanded Premiership welcoming Inverness, who currently sit second in the Championship, two places above Ayr in fourth.
He told the Ayrshire Post : "I have no interest in suing people or pursuing legal challenges.
"But if that is the proposal put to us, I will find myself having a very real problem.
"You can't tell me that, all of a sudden, a 14 team Premiership is the solution to our game's problems.
Most Read
"Let's be realistic about this. If we go down this road, we're doing it to appease the likes of Hearts and Partick Thistle.
"And I'm sorry but that's insane.
"If you're going to restructure, do it properly, not because you're worried about the legal challenges flying around.
"Also, why should Inverness be promoted from our league when they are in a play-off place just the same as Dundee and Ayr United?
"I would view that as grossly unfair."
The 42 member clubs are set to chew the fat as Hearts' Ann Budge and Hamilton's Les Gray lead a reconstruction taskforce.
But Ayr chairman Cameron insists his club won't be bullied into backing the much mooted 14 team setup.
Don’t miss
He said: "We've done the logical thing by finally passing the SPFL resolution.
"It was pretty ugly and not perfect, and not everyone was going to like it, but it was the best way forward in the circumstances as far as I could tell.
"We're in danger of opening ourselves up to more farce here.
"If I could be convinced that a 14 team Premiership was the way to go, of course I'd support it. But I'm not.
"And by the way, it's not like I'm a huge fan of a 16 team setup either.
"I have long argued for either 18 or 20 but we all know that will never happen.
"What I'm simply saying is you can't force through a 14 team Premiership off the back of all this. It wouldn't be right."