Kris Commons has rubbished Rangers' claims they are on for an 'Invincible' season - using former Celtic boss Ronny Deila's tenure as a comparison.

Gers crashed out of the Scottish Cup to St Johnstone last night after a penalty shootout KO following goalkeeper Zander Clark's heroics at Ibrox.

But the defeat, albeit in a spot-kick finale, showed Commons that Steven Gerrard's side are not truly able to call themselves Invincible, even if they manage to avoid defeat in their final few league fixtures.

The ex-Celtic man pointed to his former manager Deila's time at Parkhead and joked even the Norwegian was able to capture a league and cup double during his stint in Glasgow. That, according to Commons, proves the Light Blues are not near the level they are being touted as.

"For me, these results should shatter any possibility of this Rangers team being referred to as ‘Invincibles’ in years to come," he told the Daily Mail. "Even if they do go on to finish the league season unbeaten, I don’t see how you can mention them in the same breath as Brendan Rodgers’ Celtic team of 2016-17.

“They were true Invincibles who won every single domestic trophy available to them without losing a game. By definition, something which is invincible is too powerful to be overcome... It simply cannot be defeated.

“You could say that about Rodgers’ Celtic team; you can’t say it about Gerrard’s Rangers. The Ibrox side went into both of those matches against St Johnstone and St Mirren knowing that Celtic were already out of the equation.

“The trophy was theirs for the taking, or so it seemed. But they have now fluffed their lines once again — and it raises fresh questions over the mentality of this team.

“An unbeaten league campaign is very much within their grasp. In the domestic cups, however, it has been a completely different story. They were dumped out of the Betfred Cup against St Mirren and have now been knocked out of the Scottish Cup by St Johnstone.”

Commons added: “Make no mistake, the defeat to St Johnstone yesterday will have hurt Gerrard. He knows that it will raise fresh scrutiny around himself and his players. Success in the league does not make Rangers immune to criticism.

“Gerrard has won one trophy in the space of three seasons. It’s not a particularly great return.

"For goodness’ sake, even Ronny Deila managed to win a Double. In fact, it would have been a Treble had it not been for a horrendous handball decision against Inverness in the Scottish Cup. Clearly, Rangers and Gerrard are not the finished article.”