Haryanto's future is still up in the air as he continues to search for the necessary financial backing to stay on.

The Indonesian's original deal was for 11 races, but he has managed to keep his seat until the 12th round in Germany.

Team principal Dave Ryan insists there is no deadline for Haryanto's team to secure the financial backing it needs to complete the season.

"Like I've said many times, the goal is for Rio to be in the team for the entire season," said Ryan.

"That's what everybody is working to and that's what we want, but you do have to have a back-up in case that doesn't turn out to be the way the story ends.

"There is obviously a group of people looking at the options but hopefully we won't need them.

"There is no real deadline. There might be an obvious point, but the longer we can give Rio and his team the opportunity to get their finances together, the better it can be for them."

Several drivers have been linked to Haryanto's drive alongside Pascal Wehrlein, but Ryan says the team has not made any decisions yet.

"We have that point and obviously we are going to do our best to keep it, and we are are quicker than Sauber," he added.

"Things may change in the different races coming up. Pascal is doing a great job. Rio, given the the right set of circumstances, does a great job as well, so we are taking it as it comes."

Additional reporting by Jamie Klein