Antonio Conte watch: He is already barking away on the sideline. This man has bags of passion.

Jose Holebas steps in with a vital interception as Eden Hazard's teasing ball is fired across the Watford box.

Before that it was Watford who were asking all the questions.

A lovely ball over the top from Miguel Britos finds Jose Holebas in the box who shoots but Thibault Courtois spreads himself and saves with his feet.

First proper chance of the match.

Pedro is seeing plenty of the ball and Chelsea are showing a lot of endeavor. 

Diego Costa forces a corner which is taken by Eden Hazard but headed away by Sebastian Prodl.

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Sebastian Prodl clatters into Diego Costa in the middle of the park. He concedes a free-kick, but you get the feeling he was making a point to the Spain international. It was a 'let them know your there' challenge.

We're under way.

Those two new Watford signings...

High top white trainers were obviously mandatory.

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Right the teams are walking out...

It's almost time.

But standing in Costa's way...

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Just in case you're wondering...

Diego Costa scored the winner for Chelsea on Monday against West Ham. But many felt he shouldn't have been on the pitch after a late challenge on Hammers keeper Adrian.

Since he joined the club in the summer of 2014,  Costa has scored 33 Premier League goals; 14 more than any other Chelsea player in that period. 

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Antonio Conte and Walter Mazzarri met seven times in Serie A as managers, with Mazzari only coming out on top once, in their first meeting, as Mazzari's Napoli beat Conte's Atlanta 2-0 in January 2010.

Conte won three and drew three of the following six, all for Juventus.  

In case you missed it, Watford were busy splashing the cash yesterday.

They completed the double signing of Juventus midfielder Roberto Pereyra and Sunderland's Younes Kaboul.

And the pair have just been paraded at Vicarage Road.

Kaboul, 30, has joined from Sunderland for an undisclosed fee on a three-year deal after asking for a move away from the north-east for personal reasons.

Pereyra, 25, becomes the Hornets' record signing on a five-year contract.

Watford's previous record transfer was the £12.5m they paid Granada for striker Isaac Success in July. The fee for Pereyra has not yet been revealed.

But neither player is in the match day squad today.

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Chelsea head coach Antonio Conte on his relationship with Walter Mazzarri: "I saw (Mazzarri) in the managers' meeting. I spoke with him about this new experience, this is a great challenge also for him.

"When we were in Italy and we fought for the title, Juventus against Napoli, yeah (there was a fall-out), but when you stay up and you are fighting for the title everyone fights for their club.

"But the relationship is very normal, I have great respect for him and his work. I think he's a good manager."

Both managers were animated during their Premier Leagues debuts.

Will we see more of this today?

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Mark Scott
MOTD commentator

When thoughts turned to the managerial duels this season that have a bit of added spice, this one might have slipped under the radar a little.

Walter Mazzarri and Antonio Conte fell out, external during their time coaching Napoli and Juventus respectively because, so the story goes, Conte felt Mazzarri had suggested he'd 'copied' Napoli's formation.

The Watford boss insisted his comments had been misunderstood, but formations remain a hot topic for both managers.

Watford seem to have adapted well to Mazzarri's preferred 3-5-2 line-up, putting in a solid showing at Southampton.

Conte's focus on overloading out wide against West Ham allowed Eden Hazard to deliver a performance much more in keeping with his fine form of two seasons ago.

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One change for Chelsea as Pedro comes in for the injured Willian.

Manager Antonio Conte said: "He has a small problem with his calf so better not risked today. It's a little problem."

Cesc Fabregas remains on the bench.

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Watford's newest signings Roberto Pereyra and Younes Kaboul do not make the match-day squad.

There is also no sign of Isaac Success or Brice Dja Djedje.

The Hornets are unchanged from the team that drew 1-1 with Southampton. Ben Watson is suspended after he was sent off 12 minutes after coming on as a substitute last week.

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Image source, Getty Images

It's an all-Italian battle at Vicarage Road this afternoon.

Two new managers, both finding their feet in the Premier League. Two feisty managers in Antonio Conte and Walter Mazzarri, who just happen to have a bit of history from their days managing in Serie A.

There could be fireworks today.

Plenty to look forward to, but first the team news.