Graeme Shinnie says seeing Gary Mackay-Steven being knocked out was the worst injury he has seen on a football pitch.
And the Aberdeen captain also says seeing his stricken team-mate puts football in perspective.
The Dons winger was involved in a nasty clash of heads with Celtic defender Dedryck Boyata in the 39th minute.
Mackay-Steven had headed on Shay Logan’s cross and then clashed with Boyata as the Belgian tried to get to the ball first.
The game was stopped for six minutes as the 28-year-old was treated by medical staff.
Mackay-Steven was eventually stretchered off and taken to hospital with concussion, with Aberdeen confirming the winger has now been released after undergoing tests.
He will certainly miss Wednesday’s Premiership clash with Rangers at Ibrox as he recovers.
His skipper Shinnie was visibly upset in the moments after the collision and was gesturing for medical staff to hurry on to the pitch.
In the aftermath of the incident, Shinnie said: “These things happen in football and you have to deal with it.
“But what happened to Gaz puts it in perspective a bit. It was a bad injury and it was not nice to see.
“There’s more to it (life) than football and we wish Gaz all the best. The medics dealt with it really well.
“I was just hyped up seeing Gaz the way he was.
“It was one of the worst I’ve ever seen since I started playing football.
“I was just wanting to get things moving as quickly as possible and to get him the help he was needing.
“He was out cold. He was knocked out but I don’t want to go into much more about what I saw out of respect for Gaz.
“It wasn’t nice but the medics did really well to give him the help he needed.”