Manchester United were denied a smash-and-grab victory after Mason Mount scored his first goal for the club in second-half stoppage time as Kristoffer Ajer netted a 99th-minute equaliser in a dramatic finale on Saturday night.
The Bees couldn't open the scoring despite dominating the first half and out-shot the Red Devils by 31 shots to ten in total but no breakthrough came until two goals arrived in the space of four minutes.
The result sees Man Utd lose more ground on top-four rivals Aston Villa and Tottenham, while Brentford remain without a win since February and are only five points above the Premier League relegation zone.
Brentford headed into Saturday night's fixture without a victory since February, while Man Utd were in need of three more points having seen Tottenham and Aston Villa both earlier win in the race for Champions League qualification.
The two sides traded jabs in the opening stages but the Bees soon started enjoying chances of greater quality. Yoane Wissa squeezed a ball through for the onrushing Ivan Toney, whose shot beat Andre Onana but bounced back off the woodwork.
The frame of Man Utd's goal was rattled once again shortly after the half-hour mark. A short corner was eventually floated to the back post where Mathias Jorgensen headed an effort onto the top of the bar.
Toney threatened again from a long ball over the top and skipped towards the area on the counter, but the England forward's shot soared over the target.
It was tough watching for Man Utd boss Erik ten Hag, with his side's only shot on target in the first half coming from a hopeful Marcus Rashford pop from distance. The visiting defence was carved open regularly, with one occasion seeing Vitaly Janelt play in Mads Roerslev. His ball found
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