Michael Stewart has claimed Willie Collum "bottled it" as he did not produce a red card for Rangers striker Fabio Silva.

The Viaplay Sports pundit questioned Collum's leniency over a foul from Silva on an opponent.

The forward had already been booked after 24 minutes in the first half.

But, he escaped a possible second yellow and sending off in the second half as he caught a rival defender late in the second half.

For Stewart, Collum "bottled it" as he insisted Silva should have walked for a second yellow - even if he admitted his first caution was harsh.

"Willie Collum has bottled it," said Stewart on commentary after the incident.

On whether there was a lack of consistency, Stewart groaned: "It's clear there isn't any. The referee has bottled it."

READ MORE: Southgate confirms Rangers' Butland among England options

Ayr United boss Scott Brown was left furious at the decision and was booked for his protests to fourth official Craig Napier.

Clement earlier this week insisted he would quit his job instantly if he thought a referee were not neutral.

He said: "I am happy to be honest. When there is one moment that I would think a referee is not neutral I would directly quit my job. So I am happy we can leave the past behind us."

The Belgian then revealed he played no part in the request made by Rangers over Collum.

He added: "No. That is something for in the club and we've talked about it. But that will happen in the future, yes."