Latest Chelsea news: Costa's hamstring, Courtois and chasing the new Vieira

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All the latest Chelsea news including the Blues rivaling Arsenal for the 'new Patrick Vieira', Diego Costa's fitness and Thibaut Courtois' work-ethic.

Ligue 1 side Olympique Marseille may have to fend off dual interest in their holding midfielder Gianelli Imbula, according to The Express, as London rivals Chelsea and Arsenal are both pondering the prospect of recruiting the man dubbed "the new Patrick Vieira".

The player has good physical attributes, is 6 foot and one inch tall, is adept at protecting a rearguard but also has the capability of fulfiling a more all-action role as he can also be found roaming from box to box, much like the former Arsenal skipper.

Chelsea, though, may have already secured the signing of the year having successfully bought prolific goal-scorer Diego Costa.

The Spaniard is currently nursing a problematic hamstring, an issue he may have had since his days with Atletico Madrid and may have been aggravated on international duty.. Due to the complexity of the issue, Costa will not be able to play regularly.

"Costa has a problem," conceded Jose Mourinho. "If he has one week to let the muscle recover he can start a game. Playing on Saturday, three days is not enough for him to recover."

He continued: "He played here one match and he was perfect. He went to the national team and after the game against France he came back to us injured. He was not in condition to play [against Schalke]. Sunday we believe he is.

"Next week against Bolton [in the Capital One Cup] for sure he isn't. We have to manage the situation until the moment he's completely fine. If today he starts the game, for sure he cannot play on Sunday. We have to go step by step."

And finally, goalkeeper Thibaut Courtois has spoken of the need to win home games, the importance to not become complacent as the big games to continue to come and highlighted the differences between his loan club - Atletico - and his permanent employer; Chelsea.

"At home you always have to win your games. We could have won, we had chances to score when we were winning 1-0. We knew they were really strong on the counter-attack, in the first half they were dangerous without having big opportunities but in the second half they scored a goal when we lost the ball."

He continued: "But we have to continue working because on Sunday we play Manchester City and that’s a great game. We’ve won all four games in the league; a draw was not to be expected, we expected to win, but the season is very long and hopefully next time we’ll get a victory."

He concluded: "Every game I played last season in the Champions League is helping me now but, before I played in the competition with Atletico Madrid I’d played in big matches against teams like Barcelona. I am used to playing in big games and I have that experience."

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