Simon Ferry has lifted the lid on Roy Keane 's debut against Clyde as Celtic suffered one of the biggest Scottish Cup shocks.
The Parkhead side were knocked out of the competition in 2006 as League One side beat Gordon Strachan 's men 2-1 at Broadwood.
It will always be remembered as the former Manchester United star's first game in a Hoops shirt.
Celtic have been drawn against Danny Lennon's side in the fifth round of the competition 14 years on.
And with a rematch on the cards former academy graduate Ferry, who was in the squad that day, reflected on the historic upset on the latest episode of Open Goal's Keeping the Ball on the Ground with Kevin Kyle and Paul Slane.
Ferry admitted Keane didn't say a word in the build up to the game as he gave Paul Telfer a 'death stare' for forgetting his shin pads.
He said: "I was in awe, I just stared at him the full time. He didn't say a word. I was staring at him and he never said a word.
"I was expecting him to be pure, 'come one'. But no.
"He just sat with a smile on his face. See when we got in from the warm up he just sat smiling. He must have thought, 'what the f*** am I doing here?' Because there was only one stand I think, the rest of it you could see the car park!
"Paul Telfer forgot his shin-guards in the tunnel and I remember him saying, 'Oh no, I forgot my shin-guards', and Keane gave him the absolute death stare."
Keane wasn't at his best on the day but Ferry says Chinese defender Du Wei was exceptionally poor and his Celtic career never recovered after his performance.
The 32-year-old also revealed there was a dressing room summit back at Parkhead immediately after the surprise result.
He added: "Big Du Wei man. He played in that game. He could play in training but defensively when boys got up against him (he struggled). Do you remember big Alex Williams? He flung him about man.
"It was silence (after the game). And then we got back to Celtic Park and the fans were waiting and going mental.
"Strachan said there was a meeting and told everyone to get in the first team dressing room.
"So Strachan was away for about an hour and we were all waiting. Keane says to Neil Lennon, 'Lenny, go and see what's happening.'
"Lenny went through and got Strachan and then they had a big free for all.
"Keane never said a word. I kept thinking, 'I'm going to see Roy Keane crack here.'
"The game just passed him by, it was 100 miles per hour. (Craig) Bryson was just bombing it. Clyde were good that day. Du Wei was never seen again."
