West Midlands police later confirmed the supporter had been arrested, while Grealish went on to score the decisive goal as Villa won 1-0.
After Arsenal defeated Manchester United 2-0 to hand Ole Gunnar Solskjaer his first Premier League defeat of his Red Devils managerial tenure, Emery wanted to make sure his team remained focus on the task at hand.
"They (United) were in a good moment after one result against PSG but we had a big performance and we are in a good moment in the Premier League". Subscribe to our SMS sports service by texting "SPORTS" to 22840.
However, Arsenal were almost hit with a sucker punch when with United's first attack, Romelu Lukaku turned Luke Shaw's cross onto the crossbar for the first of a series of wasted chances for the Belgian striker.
On whether De Gea should have done better with Xhaka's effort, Solskjaer said: "The ball moves so odd and when you see it on telly, it's on of them where it looks like it goes to David's left and then just changes direction".
"I was stood right behind the ball and we don't put enough pressure on Xhaka, who must be Brazilian by the way because he struck the ball and it swerves and moves".
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Elsewhere, Roberto Firmino returned to goalscoring form at the ideal moment for Jurgen Klopp's Liverpool, hitting the net twice in a 4-2 victory over Burnley that hauled them back to within a point of Premier League leaders Manchester City.
United had as many as ten injuries in that game and played a lot of reserve players and had four current academy players on the bench. "We created chances but when they get the first goal it's a different game".
"We were playing very competitive for 90 minutes and I think we deserved this victory".
United came back strongly but were unable to take their chances, thwarted by Bernd Leno in the Arsenal goal.
Emery's side are unbeaten in their last four matches, including an impressive 1-1 draw with Tottenham last time out, and they will look to continue that run with a positive result at the Emirates Stadium on Sunday. But I came back the next morning with a big spirit, with a big confidence for Sunday first and also for this week.
Still, Fred mostly looked like out of place and far from the necessary levels to play for Man United, but now he is beginning to change that view.
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