Chelsea manager Antonio Conte blamed a loss of composure after the Premier League champions were shocked 3-2 by Burnley in their opening game of the new season on Saturday.
Chelsea had captain Gary Cahill and Cesc Fabregas sent off and Burnley took full advantage through Vokes's brace and a superb Stephen Ward effort, with goals from Alvaro Morata and David Luiz coming in vain.
And finally, Ronald Koeman and his band of new Everton signing's host Stoke City on Merseyside, looking to get off to a good start in their pursuit of breaking into the top six.
Burnley actually had the ball in the back of the Chelsea net in the 19th minute when Vokes headed home from close range, but the goal was disallowed, much to the relief of the home side's supporters.
That was due in part to the belief that Burnley now possess, having retained their Premier League status last season.
Mourinho had been unhappy with Petr Cech's transfer to Arsenal that summer and wanted to strengthen in a number of positions. One to keep an eye on in the Championship will be in Derbyshire, with Derby County hosting Wolverhampton Wanderers, two clubs with big promotion ambitions. Burnley, capitalizing on the hosts playing with 10 men for most of the match before finishing with nine, stunned the Blues at Stamford Bridge, 3-2, holding on late.
"But our first half we kept losing our heads - after the red card we lost our heads, conceded two goals and then it's very difficult to change the final result". We'll never know, but it's the kind of trick other Premier League sides pull on a regular basis, and falls firmly into the gamesmanship category. We have to improve a lot on this aspect, because a situation of this type can happen. The noise and everything just went to another level and we could have got something. Forget Gray, Vokes was the player Burnley couldn't afford to lose.
And Chelsea waved the underdogs through for the third as an unmarked Vokes met Defour's sublime cross with a unstoppable header.
"The red card was a key moment". I want to win.
43' - GOAL! Chelsea 0-3 Burnley.
West Brom, fresh off handing Tony Pulis a one-year contract extension, host Bournemouth at the Hawthorns, with Jay Rodriguez looking to hit the ground running following an injury-hit few years at Southampton.
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