Partick manager Alan Archibald felt his side were the victims of a "very soft" penalty award as they drew 1-1 with St Mirren at Firhill.
Kris Doolan headed in the opener for Thistle but Archibald was incensed by referee Calum Murray's decision to award a spot-kick after Kallum Higginbotham was adjudged to have bundled over Jason Naismith in the area just before the break.
"I thought it was a very soft penalty. I've seen them given and I've seen them not given, for us as well," he said.
"It just depends what ref you get, it's just your luck.
"I thought St Mirren dominated the first five minutes and then we dominated. But they had a good spell for the last five of the half, which led to the penalty."
Both McLean and Partick substitute Lyle Taylor hit the frame of the goal in the closing stages but the game ended in a draw, a result that leaves both sides firmly entrenched in the battle to avoid a Scottish Premiership relegation play-off.
"It was an even contest, we had spells and they had spells, but I thought we were going to nick it at the end," added Archibald.
"We had a wee bit of pressure and I thought we had done enough."
St Mirren manager Danny Lennon also felt a draw was a fair result and praised his charges for a spirited end to the contest.
"I've got to praise the character of the players for the last five to seven minutes of the second half when we showed the first glimpses of what we are capable of," he said.
"We kept the pressure on and got a lot of quality balls into the box, which is where the penalty came from.
"The penalty was a wee bit far away from me but we were showing good momentum and I'm always delighted when you see one full-back crossing the ball and another trying to get on the end of it.
"It wasn't a game for the purists, both sides cancelled each other out, but in a strange way it was a fantastic game with the atmosphere, the cameras and the rain.
"It was a real emotional game, going for you and against you."