Rangers manager Russell Martin is in "big trouble," according to Ally McCoist.
The comments come after last night's 1-0 home defeat to Genk.
The Belgian team took the lead in the second half when former Celtic striker Oh Hyeon-gyu scored the winning goal.
His strike was enough to beat Jack Butland and secure a victory for Genk.
The match also saw a dramatic first half, with Rangers being denied a penalty for handball, Mohamed Diomande being sent off for a high tackle, and Butland saving a spot kick from Oh to keep the score level heading into the break.
This defeat follows Rangers' 2-0 League Cup win over Hibernian on Saturday, which had raised hopes of a turnaround in form.
After the final whistle at Ibrox, boos were heard from the home fans, with further chants of 'Martin, get to f***'.
McCoist, who was speaking post-match on TNT Sports, supported the fans in their disappointment.
He said: "They're totally justified in their disappointment at what they're seeing.
"It clearly hasn't been good enough.
"You can point to the red card but it goes deeper than that, the level of performance hasn't been good enough.
"Coming into the stadium tonight, you could have blown me away.
"It was nothing like a normal atmosphere of any game, never mind a European game at Ibrox.
"There was apathy, there was no life about the place, on or off the pitch, which is really concerning.
"The manager is in trouble, he's in big trouble.
"Something has to change dramatically.
"And on the current evidence, sadly, I can't see it happening."
Kris Boyd, speaking on Sky Sports, insisted that the club's American ownership have no other option than to start looking for Martin's potential successor now.
He stated: "Looking at it right now, there is no other option than to start looking.
"Not only for a new manager, but the recruitment needs an overhaul.
"Russell Martin will be the one that ends up paying the price.
"But there's other people at the club who need to be held accountable as well.
"Because right now, the disconnect from the stands onto the pitch and beyond, is as bad as I've ever seen."
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