But the unfortunate Celtic captain is not the first, nor will be the last, to turn into his own net during one of the biggest games of the season.
We took a look back on the last ten own goals scored in Old Firm encounters – a flashback that stretches all the way back to halcyon days for both sides in the early-1970s.
. GLASGOW, SCOTLAND - JANUARY 02: Callum McGregor in action for Celtic during a Scottish Premiership match between Rangers and Celtic at Ibrox Stadium, on January 02, 2021, in Glasgow, Scotland (Photo by Craig Williamson / SNS Group)
Captain Callum McGregor turned into his own net on January 2, 2021 to give Rangers a 1-0 win. (Photo by Craig Williamson / SNS Group) Photo: Craig Williamson - SNS Group
. 2010-11
24/10/10 - Dutchman Glenn Loovens knocked a Kyle Lafferty effort into his own net just after half-time in a 3-1 win for Rangers at Parkhead Photo: SNS Group Sammy Turner
. 2005-06
09/11/05 - Stefan Klos conceded during a goalmouth mix-up involving Bobo Balde and Hamed Namouchi as Rangers went out of the CIS Cup quarter final 2-0 Photo: SNS Group Jeff Holmes
. 1995-96
19/11/95 - Tosh McKinlay knocked in Rangers' third, much to Ally McCoist's delight and sent the home side 3-2 ahead, but Celtic pulled them back again to draw 3-3 Photo: SNS Group
1. 2010-11
24/10/10 - Dutchman Glenn Loovens knocked a Kyle Lafferty effort into his own net just after half-time in a 3-1 win for Rangers at Parkhead Photo: SNS Group Sammy Turner
2. 2005-06
09/11/05 - Stefan Klos conceded during a goalmouth mix-up involving Bobo Balde and Hamed Namouchi as Rangers went out of the CIS Cup quarter final 2-0 Photo: SNS Group Jeff Holmes
3. 1995-96
19/11/95 - Tosh McKinlay knocked in Rangers' third, much to Ally McCoist's delight and sent the home side 3-2 ahead, but Celtic pulled them back again to draw 3-3 Photo: SNS Group
4. 1994-95
07/05/95 - Craig Moore could only watch in horror after helping the ball into his own net for Celtic's third in a 3-0 win at their temporary home of Hampden in 1995. Photo: SNS Group