Manor remain in the frame to make it onto the 2015 grid with the FIA delaying publishing the official entry list until the team confirm its plans, according to a report.
The Banbury-based squad, who drove under the Marussia guise last season, lodged an entry for the 2015 Championship under Manor Grand Prix, but their hopes were dealt a blow when they were denied permission to race with an updated 2014 car.
The team, though, have been told they can make another bid and, although they are unlikely to make the season opener in Australia on 15 March, they have now set their sights on the flyaway races with a 2015 car.
With Manor's entry fee paid up, Autosport reports that the FIA have made it clear they "will keep the entry list open as long as possible".
The report adds that "final entry lists are normally published well ahead of the season, but the FIA has not yet finalised the current one yet – and is holding back until it knows what Manor is doing.
"Autosport has learned that since the strategy group vote, the FIA has been in discussions with Manor regarding how best to proceed as it seeks assurances that losing the hoped-for 2014 car concession has not destroyed its hopes of a return."