The 41-year-old has been parachuted into one of the most high-pressure jobs in English football after a successful spell at Strasbourg, who are also run by Chelsea's owners BlueCo.

Enzo Maresca left Stamford Bridge on January 1 despite winning two trophies -- the Club World Cup and Europa Conference League -- during his first season in charge.

But Chelsea have won just one of their past nine Premier League games to slip to eighth in the table and the pressure is on Rosenior to secure Champions League qualification next season via a top-four finish.

"The talent levels I have seen over the last few days -- the ability levels are world class," Rosenior said on the eve of Chelsea's FA Cup trip to second-tier Charlton.

"The previous coach Enzo has done a good job tactically and it is my job to take it to the next level, and me and my staff are going to work very hard to do that.

"If you are scared or fearful, there is no point being a coach. I am going to work 24 hours a day. I am going to push them to try and be successful."

Rosenior watched from the stands as Chelsea lost 2-1 at west London neighbours Fulham on Wednesday.

There were banners and chants amongst the visiting fans at Craven Cottage lashing out at BlueCo's running of the club.

Maresca became the fourth permanent manager to depart the club in three and a half years since the American-backed consortium took control of Chelsea.

Rosenior rejected suggestions, though, that he has been hired to toe the line of his superiors.

"I don't think it is possible to be in this job and not be your own man," he said.

"I understand, I am not an alien and I know what is being said in the press, but there is no way you can be a manager if you don't make the decisions for yourself.

"We have had huge success at Strasbourg and I intend to work the same way here."

Under BlueCo, Chelsea's model has focused on hoovering up young talent from around the globe.

But amongst Maresca's complaints was a lack of experience that resulted in inconsistent performances.

Rosenior said that he is confident that the approach can succeed from his time at Strasbourg.

"A club of this stature, the fans want success and they have every right to want success now. My job, to win over the fans, I have to win football games," he said.

"We're trying to build things here in a different way. I'm very confident that in time we will show everyone why we have done it in this way."