Following the two-week international break, Erik ten Hag's side resumed their hopes of achieving Champions League qualification with a trip to the Gtech Community Stadium, where Thomas Frank's Bees awaited.
Having lost five of their last six matches in the league, Brentford did well to hold Man United until added-on time, when a returning face found the net for the visitors.
Arriving off the bench for only his second cameo since picking up an injury in November, Mason Mount struck in the 96th minute to seemingly seal three points for the Red Devils.
However, it was the Londoners who managed to have the last laugh as they levelled the contest in the dying stages, with Kristoffer Ajer bagging his second goal of the Premier League campaign, forcing a share of the spoils.
Dropped points and injury woesAs well as losing ground on Tottenham Hotspur in the race for the Champions League, Ten Hag's troops also lost two defenders to fitness issues at the Gtech.
World Cup winner Varane received a heavy impact to his ankle as he blocked a fierce shot from Brentford marksman Ivan Toney in the first period.
Although the Frenchman was able to soldier on until the half-time whistle, he did not remerge for the second period, with Harry Maguire coming on in his place.
By the end of the contest, the visitors were battling on with a new centre-back partnership following an issue sustained by Sweden international Lindelof in the closing 25 minutes.
The 29-year-old started to hold his hamstring and was soon replaced by Lisandro Martinez, who is only just returning from his
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