Wayne Rooney slaps WWE Superstar Wade Barrett in the face during Monday Night Raw

Rooney was sitting in the crowd at Monday's live Raw show when Barrett challenged him

But Rooney delivers the Smackdown as he slaps Barrett across the face (WWE.com)

Very rarely does Wayne Rooney let his guard down, and he showed just how hot-headed he can be when he slapped a WWE Superstar across the face during a live show in Manchester.

Of course, Rooney was not looking to start a fight with British WWE Superstar Wade Barrett, but their feud has some history to it that we should probably look back on.

Rooney is a self-confessed boxing fan, but he also dabbles in the world of wrestling after becoming embroiled in a light-hearted exchange with Barrett earlier this year in an attempt to organise a match at WrestleMania 31.

Rooney stands and stares as the match begins (WWE.com)

Barrett, from Lancashire and a lifelong fan of Preston North End supporter, tweeted WWE chairman Vince McMahon in a bid to organise a tag-team match between Rooney and Stone Cold Steve Austin against Barrett and the former Preston striker Kevin Davies.

Cesaro asks if Rooney would like to get involved in the match, but the United striker politely declines (WWE.com)

While the fight never happened, the confrontation between Rooney and Barrett eventually did when Monday Night Raw rolled into Manchester, and the United striker just happened to have bagged himself a front-row seat.

Barrett was ringside as Irishman Sheamus took on Swiss Superstar Cesaro as part of the WWE World Heavyweight Championship tournament.

Irishman Sheamus confronts Rooney and Barrett makes his way over (Getty Images)

And as Barrett approached Rooney, the 30-year-old footballer seized his chance and slapped Barrett right across the chops, much to the crowds delight.

Barrett taunts Rooney by poking a finger at him (WWE.com)

But Rooney delivers the Smackdown as he slaps Barrett across the face (WWE.com)

Watch the video below…

King @WadeBarrett and @WWESheamus just got SERVED by @WWECesaro and @ManUtd's @WayneRooney! #WWETitle #RAW https://t.co/ppwjG6qedR

— WWE (@WWE) November 10, 2015

After winning his match, Cesaro celebrates with Rooney in the crowd (WWE.com)

Whether this sets Rooney up for a showdown with Barrett as WrestleMania 32 next April is unlikely though, as Rooney will be needed to take on Everton that weekend as the Premier League turns towards its business end.