Sam Allardyce has revealed the reason behind his furious rant at fourth official Robert Madley towards the end of West Ham’s defeat at Manchester City on Sunday. The Hammers boss was incensed that Eliaquim Mangala was not penalised for a foul against Stewart Downing, who managed to stay on his feet despite a late challenge from City’s £32million defender. Referee Anthony Taylor took no action as the ball ran out of play and an animated Allardyce vented his fury towards Madley on the touchline. Sam Allardyce gives fourth official Robert Madley a piece of his mind during West Ham's defeat . The Hammers boss also screams at the linesman during the 2-0 loss to Manchester City . Allardyce snarls in frustration alongside Manuel Pellegrini from the touchline at the Etihad . The Upton Park boss launched a tirade at the fourth official before eventually sharing a smile with him . Allardyce cannot resist taking an extended pop at Madley from the sidelines . It was highlighted on Match of the Day but the 60-year-old later questioned whether Downing had paid the price for his honesty instead of taking a fall and earning his team a freekick. ‘Everybody goes on about simulation and players cheating and doing this and that,’ said Allardyce. ‘Mangala comes out and tries to clean out Stewart Downing. ‘Downing stays on his feet and the assistant is one yard off and doesn’t flag for the foul. So what do I say to Stewart Downing? “For God’s sake dive on the floor and get a freekick?” Because we could put the freekick in and get a goal.’ Allardyce was unhappy with Downing for giving away possession in the build-up to City’s second goal scored by Sergio Aguero, having already conceded an own-goal from James Collins. Allardyce was aggrieved because a foul by Eliaquim Mangala on Stewart Downing (not pictured) was missed . Sergio Aguero finished off a fine move to hand the Champions a 2-0 win to get their season back on track . He added: ‘The disappointing thing in the first half was the goals we gifted to City and the amount of possession we allowed ourselves to lose. ‘The two mistakes we make for the goals, one was pretty bizarre and the other unexpected from a player as experienced as Stewart Downing. ‘In the second half eventually changing the system got us going forward, and when we create as good chances as those for Enner Valencia and Kevin Nolan we have to convert them. But the most disappointing thing was the goals we gifted City.’
Manchester City defeated West Ham 2-0 in the Premier League on Sunday .
Sam Allardyce was seen ranting at fourth official during game at the Etihad .
Hammers boss explained he was frustrated that referee Anthony Taylor missed Eliaquim Mangala's foul on Stewart Downing .