Manor may finish this season without a new car with sporting director Graeme Lowdon revealing that the decision will be made in the "next few weeks."
Manor, saved in an 11th hour bid, entered this season with a 2014 car modified to fit this year's regulations.
There were, however, plans to introduce a new 2015 car at the Belgian Grand Prix.
Those plans, though, may yet to be put on the backburner.
Lowdon told Motorsport.com: "I think over the next few weeks we have some fairly key decisions to make.
"The landscape is getting a bit clearer now, in terms of who we are competing against and what we need to do.
"It is becoming a lot clearer. We will do whatever is the right thing for the company."
The Brit stated that the decision will rest largely with Manor's new technical staff including consultant Bob Bell.
Should they declare that it would be best to continue as is and plug all their efforts into their 2016 challenger, then that will be the course of action.
"We are bringing people on board all the time who will have an input in to the decision-making process.
"And there is no point having a dog and then barking yourself. So there is no point hiring these people and then telling them this is the tactical plan [to run the new car this year].
"There is no hard and fast route. There is nothing saying we definitely cannot have a different engine or a different chassis.
"Everything is open and whatever the right answer is, that is what we will do. But bear in mind that some of the people who can make a big impact in to that answer are just getting on board."