The Reds were heading towards a third straight defeat with the pressure on Erik ten Hag set to ramp up until his midfielder netted two stoppage-time goals to earn the hosts a 2-1 triumph. Mathias Jensen had put Brentford ahead on 26 minutes after Andre Onana could not keep his effort out.
However, the visitors were left crestfallen by the late McTominay show as United clocked their fourth Premier League win of the season. Here are a few things United supporters may have missed amidst the chaos at Old Trafford.
Limbs were flying in the terraces around Old Trafford when McTominay netted the winner seven minutes into stoppage time. Several United teammates reacted in similar fashion, charging down the goalscorer to maul him in celebration.
Others took a different approach. Diogo Dalot simply collapsed in the D of the penalty area in dramatic fashion. The sheer relief was one all United fans could relate to.