When it comes to football punditry, few are better than Sky Sports duo Jamie Carragher and Gary Neville.
The two former on-pitch rivals had some brilliant contests while playing for Liverpool and Manchester United, with both renowned for their fiery attitudes in the big derby match.
In the studio, they do still enjoy a bit of a rivalry and directing the odd bit of banter at each other.
A lot of the time, they agree on crucial points but on certain occasions, they get locked in a heated debate over a certain topic.
Prior to Arsenal's visit to Manchester City, the two were having a little conversation about Jose Mourinho and United, who take on Chelsea in the 4:30pm kickoff at Stamford Bridge.
The Red Devils manager certain divides opinion of late, particularly with his treatment of certain players, namely Romelu Lukaku.
Well, Neville and Carragher were certainly split on the Belgian striker's criticism.
VIDEO: CARRAGHER SHUTS DOWN NEVILLE
CARRAGHER'S BIG POINT
Neville discusses the issue that players and managers shouldn't get too concerned with the views of pundits, with him labelling it as "noise".
But, Carragher was not happy and he went on the offensive.
He believes that Neville cannot criticise Lukaku and then praise Mourinho.
"But if you're going to back Mourinho, you can't go and criticise Lukaku," he says, talking about the heavy criticism directed at the Belgian after his poor performance against Liverpool.
"He had two touches in the opponent's box and they [Mourinho] went there for a draw.
"He didn't go there and go for Liverpool, he didn't go for Tottenham, so as a centre-forward if your team does that, you're not going to get more opportunities and more involved so you can't criticise him."
Shots fired from Carra.
NEVILLE'S CRITICISMS OF LUKAKU
After Anfield, Neville was not happy and his criticism from earlier on October certainly made for interesting reading.
“I was disappointed with Lukaku,” he said on Sky Sports. “But it’s a tough place to come, it’s a really tough place to come.
“It looked like he was distracted in the first half, he wasn’t himself, he was frustrated. He really didn’t get any impact in the game, no influence.
“It’s the big matches that will define him as a Manchester United striker, not the matches where he sort of bullies teams."
He has a point and a lot of onus will be on Lukaku to turn up against Chelsea.