Three controversial moments during Chelsea’s 1-0 defeat by Sunderland at the weekend have been analysed by Sky Sports’ Ref Watch panel, with the Blues told why a penalty was given against them - and why they did not receive one themselves.

Every week former Premier League referee Dermot Gallagher is joined by pundits Tim Sherwood and Jay Bothroyd to analyse key decisions made across the top-flight during the previous weekend.

Sunderland defeated Chelsea at the Stadium of Light on Sunday thanks to an Enzo Le Fee penalty awarded in the first half.

Brian Brobbey was felled inside the area by Levi Colwill after the pair tangled, first pulling each other’s shirts outside of the box.

After they got into the area, Brobbey started to pull clear of his marker, only to go down.

Gallagher said of that incident: “They are both grabbing. It starts outside the area, the referee [Jarred Gillett] does not take sides, but once Brobbey gets in front of him and Colwill does not let go, that is when he falls foul of the penalty.

“Once he is in front, he is in the ascendancy and Colwill drags him to the ground, so I think penalty. He does clip his heels as well.”

Former players Sherwood and Bothroyd also both believed that Colwill tripped the Sunderland attacker.

Sherwood said: “They are both at it at first, then Brobbey grabs Colwill and puts him on his back like a rucksack and decides to wait for some contact on his legs. He obliges, he goes down and it is a penalty.”

Confusion: Chelsea felt they should have had a penalty against Sunderland for a foul on Cole Palmer

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Chelsea fans felt their side should have been awarded a penalty in the same half, with Cole Palmer challenged by Luke O’Nien right on the edge of the Sunderland box.

Discussing the incident involving Palmer, Gallagher believed that the referee identified Jules Ahoka as the offending player, rather than O’Nien.

Any contact from Ahoka would have been outside the box, but on closer inspection it was O’Nien’s boot that brought Palmer down - inside the area.

No foul was given, and according to Gallagher, VAR could not overrule the on-field match official, unless there was serious foul play.

That was because Ahoka was deemed to have been the first offending player - even if no foul was given.

Gallagher explained: “The referee gives a foul against Ahoka. That is what he gives.

“O'Nien completes the action when he is in the box. Once he gives the first foul, that is it. What happens afterwards, he can only take action if he deems there is serious foul play.

“That is what he fed back. What he has to do is, when he is talking to VAR, he has to say who he thinks is the player [committing the foul].

“It is O'Nien's boot in the penalty area. The argument is that if he is on the line, it is a penalty. But it is O'Nien's boot; you can't see the ball.

“O'Nien goes second. VAR said Ahoka went first and he is the first offender. They didn't stop the game. The game went on.”

The game’s final flashpoint involved Chelsea star Morgan Rogers and Trai Hume. Rogers caught Hume in the head with his knee as he walked past the Sunderland defender, who was on the ground.

Gallagher said of that incident: "When you go on the wide camera, Rogers isn't looking at him. Maybe I'm giving him the benefit of the doubt, but only Morgan Rogers knows his intent. He may have accidentally done it, only he knows."