Chelsea midfielder Barkley scored a last-gasp goal to secure a dramatic 2-2 draw with Manchester United at Stamford Bridge.
Leading 2-1, United were seconds away from winning at Stamford Bridge for the first time in six years and scooping the three points at stake, but a goalmouth scramble in the 96th minute saw Barkley send a low shot past goalkeeper De Gea.
The equalising goal came after a wicked header from defender David Luis had struck the post and the rebound effort from Chelsea defender Rudiger had been saved by De Gea.
Chelsea controlled the game in the first half, taking a deserved lead in the 21st minute when David Luis and Rudiger combined to "fool" Man United midfielder Paul Pogba and create an opening for Rudiger to power a header past a hapless De Gea.
The Blues controlled the game after that, with United struggling to find a response.
But after the break, a rejuvenated Man United side equalised through a Martial strike in the 55th minute. Martial scored again in the 73rd minute to give Man United the lead, but Chelsea rallied hard to get a late equaliser.
The result means both sides get a point, and Chelsea maintain their unbeaten record this season.
What was a great match was nearly marred after Chelsea's equaliser when the Blues technical assistant Marco Ianni celebrated in front of Mourinho before then pumping his fists in the United coach's direction again.
The Portuguese jumped from his seat and was then held back by a mixture of stewards and Manc United staff as he attempted to get down the tunnel at Ianni.
It was a dramatic conclusion as Mourinho saw victory snatched away after he had replied to the taunts of Chelsea fans by holding up three fingers to remind them of the three Premier League titles he won while in charge at Stamford Bridge.
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