Pundit Kenny Miller was stunned over Dujon Sterling's red card against Aberdeen.

The midfielder - subbed on after 75 minutes - was only on the pitch for 13 minutes before being ordered off.

Sterling flew into a challenge on Jack Mackenzie with 88 minutes played and was immediately shown a red card by Don Robertson.

However, it appeared the midfielder may be allowed back on as Robertson was called for an on-field review by VAR Greg Aitken.

Robertson, though, stuck with his decision and ordered Sterling to head up the tunnel. 

Replays of the incident showed speed in the challenge but also showed Sterling's tackle perhaps wasn't as high as first thought as he caught Mackenzie on the top of the boot.

Sky Sports co-commentator Miller said: "He was going in very, very fast. I think the reaction of Mackenzie hasn't helped his case.

"That's not a red card. He has slid in, his feet are not high at all, he has maybe caught him on the top of the toe. 

"I don't think that is a straight red card. I think he has slid as well. 

"It's not high, it's not even high on the leg, I don't think that is a red card.

"I think this will be overturned."

As Robertson confirmed his decision would stand, Miller admitted: "I must say I am surprised because Sterling has caught him on the toe. Very surprised that wasn't overturned."