Pep Guardiola was involved in a furious half-time argument in the tunnel during Man City's 1-0 shock defeat to Wigan in the FA Cup on Monday night.

An incensed Guardiola stepped onto the pitch after Fabian Delph was shown a red card for a lunging tackle on Max Power, and later confronted Wigan manager Paul Cook in the tunnel.

Staff from both teams had to separate the pair and an enraged Guardiola was then led away to the City dressing room.

The incident started after Delph leapt into a dangerous tackle on Power just before the break, leaving the midfielder in a heap on the floor. Initially, referee Anthony Taylor appeared to be preparing to show the Man City player a yellow card but after a few seconds of deliberation, instead awarded a red.

Delph tackle

Cook had angrily complained to fourth official that Delph should be sent off after sliding into a tackle near the Wigan box and this reaction seemed to set the City bench off, as they erupted upon somewhat literally seeing red.

Guardiola could be seen waiting for the officials and Cook to arrive in the tunnel on a designated tunnel camera after the half time whistle.

Guardiola squares up to Paul Cook credit: BBC Sport

In an interview with a BBC reporter after the match, Cook insisted there was "no problem" between the two managers:

"There's no problems. From our point of view we're trying to get every edge in everything we can.

"From Pep's point of view he wants the game played, and correctly so.

"We certainly wish them well fighting on all fronts because they represent English football so well."

The red card divided opinion on social media, though Alan Shearer and Jermaine Jenas both offered the opinion that although a heavy challenge, the incident only merited a booking. Delph's challenge comes just days after Guardiola had complained about the risks his own team had faced from tough tackling by opposition players.

Fabian Delph's tackle on Max Power credit: PA

Guardiola was quick to praise the side to have ended his hopes of a quadruple but denied clashing with Cook at half time.

"Congratulations for Wigan for the qualification. We did absolutely everything, we made a mistake and this kind of game is like a final. OK, we accept the defeat. Congratulations to the winner."

"Red card. It was the decision.

"Nothing happened (at half time)."

Some fans allegedly clashed with police officers after the final whistle credit: REUTERS

At the final whistle, Wigan fans ran on to the pitch and celebrated with players. TV pictures appeared to show Sergio Aguero lashing out a rogue supporter, while security staff surrounded the Man City supporters' section of the DW Stadium.