Despite praising his driver pairing, Marussia sporting director Graeme Lowdon will wait until December to confirm his 2015 line-up.
Earlier this season, Jules Bianchi broke Marussia's duck in the standings when he finished in ninth place in the Monaco Grand Prix.
Those two points have put his team ninth in the Constructors' Championship, Marussia's best position since entering Formula 1.
His team-mate Max Chilton has also done a solid job with two P13s to his name.
"I think they're both doing a great job," Lowdon told Crash.net.
"We seem to have a good atmosphere, the drivers push each other in a healthy way - we've only had that one coming together of both cars in Canada -...
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