Lotus' participation in the 2015 Formula One world championship is uncertain after the team were not confirmed on an updated entry list.
The British-based constructor endured a torrid 2014 campaign, amassing just 10 points over the 19 races, with only strugglers Sauber, Marussia and Caterham below them.
Lotus have already named Romain Grosjean and Pastor Maldonado as their drivers for 2015, however the International Automobile Federation (FIA) entry list shows the team's participation as being "subject to confirmation".
That will raise further questions about their financial stability after struggling ahead of the previous campaign due to a debt owed to Genii Capital.
Two other constructors "Caterham and Manor F1, who are looking to replace the folded Marussia - are also yet to be confirmed for the new season, with both teams still to announce their driver line-ups.
Australia will again host the opening race of the F1 calendar in March, with defending champion Lewis Hamilton opting not to don the number 1 on his Mercedes" instead sticking to the number 44 he triumphed with in 2014.
Meanwhile, former champion Sebastian Vettel will take the number five when he makes his Ferrari debut in Melbourne.