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Rosenior, who is preparing for his first taste of top-flight action, revealed that both Liam Delap and Jamie Gittens have been struck by the illness and are likely to miss out.

"Liam [Delap] is still at home at the moment, as is Jamie Gittens," Rosenior said.

"The club doctors are doing everything they can to contain what looks to be a virus because some members of our staff have gone down as well.

"We had a meeting today with the players about washing their hands, the basics, which is really important, and hopefully we can contain it.

"We have a busy period so we need everyone ready to go and fit and healthy."

The former Strasbourg boss has endured a mixed start to life with the Blues, with his third-round win over Charlton Athletic in the FA Cup followed up by a 3-2 defeat in the first leg of the Carabao Cup semi-finals against Arsenal. 

But Brentford will pose a huge test for Chelsea, with Keith Andrews' side fifth in the Premier League, and out to spoil Rosenior's maiden outing in Premier League management.

The Bees have had a full week to prepare for the trip to Chelsea, after their 2-0 win over EFL Championship struggler Sheffield Wednesday in the FA Cup third round.

They have made a fine start to the Premier League campaign, but have not stood still with the January transfer window opening, with Kaye Furo joining from Club Brugge this week. 

The 18-year-old played in eight games for the Belgian side this season having made his senior debut in August, scoring his first goal for the club in December.

"Kaye is someone we have tracked for a while that we are really excited about bringing to the club," Brentford boss Andrews said.

"His attributes are ones that I like and feel we can develop within the environment we have created. I have no doubt he will be a big player for us."

Furo stands at more than six feet tall and will add another dimension to Brentford's attack, with the teenager describing his move to the Premier League as a dream.

"It's very exciting to be here and I just feel very grateful. It's a dream come true for me to come to a club like Brentford," Furo said.

"Brentford is the right club because of the energy from the moment I came here and the moment I saw everybody for the first time.

"The moment I came here, I saw this was a family club and the energy is real, it's not being faked or played."