Max Chilton and Giedo van der Garde head into this weekend's Indian Grand Prix without knowing their F1 futures, although both remain confident of remaining in the top flight next season.

The pair, who have taken their GP2 Series rivalry into F1 with Marussia and Caterham respectively, are not the only members of the 2013 grid still to learn whether they will still be there next year but, with teams at the back of the grid the most likely to promote new talent, are well aware that there will be no shortage of applicants for their seats.

While Chilton appears to only have eyes for Marussia, van der Garde's management continues to tout his services around the paddock, with both Williams and Force India having been mentioned as possible destinations for 2014.

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"Of course, I hope to stay in [F1] next year, but the management is very busy, talking to some teams, also Caterham," the Dutchman confirmed, "At the moment, they told me to be focused for the last four races and I'm doing that, but hopefully we will have some news soon."

Racing at the back of the grid does not necessarily allow drivers to properly show what they are capable of, but van der Garde believes that he has done enough, particularly in the second half of the season as Caterham battles to recover tenth place in the constructors' championship, to warrant a second year.

Yeah, I think so," he noted, "At the beginning, I struggled a little bit, then, in the middle of the season, everything fell into place and, since then, I've had good speed. I still have to improve the qualifying a little bit, but race pace has been very good.

"Of course, for us, it's very important to get the tenth place back. I think, in the last few races, we've seen that we've always been in front in the race compared with Marussia, so the one thing we need is a little luck. The only thing we can do is maximise ourselves, maximise the car, maximise the team - the rest is luck."

Chilton, of course, is part of the pairing attempting to defend a hard-earned tenth spot, courtesy of Marussia team-mate Jules Bianchi's 13th place in Malaysia at the start of the year.

"It's definitely tense, but I believe that, when you're passionate and working on the best result possible, you get the best out of yourself and the team," he claimed, "At the moment, we're doing that. It's definitely going to be tight, but we've got tenth at the moment and we're hoping to keep it that way until the end of the season."

Of course, the financial rewards for finishing tenth may make it easier for Marussia to retain its British driver.

"I think my chances are looking good, [although] nothing's set in stone yet," he admitted, "I've learned in GP2 how much continuity can help, so I'd love to stay with Marussia again because you always get more out of yourself when you know the team, it's a natural progression. We have been contacted by other teams but, at the moment, we know where we want to be and we're not far away from it now."

Like van der Garde, Chilton acknowledges that it took time to get to grips with the demands of F1, but produced his best performance of the season at Suzuka last time out, and hopes to be able to build on that over the final four rounds.

"I think, to be honest, it took me a little bit longer than I was expecting to get up to speed.," he confirmed, "I think it's hard without the testing but, from the August break, when you have a bit of time to go through everything with the team, we had a really good sit down and picked on key areas where you can really enhance your performance and, since then, I think I've proved why I deserve to be here and I'm hoping to keep that on until the end of the year.

"Obviously, [Japan] was a bit of a stand-out performance because we managed to out-qualify both Caterhams and Jules. I've had good laps in the year and I've been very happy with certain laps but, in Japan, we just managed to get things right. It was a bit of a manic last lap and I managed to just get enough space and just got the most out of the car and the car performed well - if you get everything right then you get good performances."