Trident will field GP2 returnees Nathanael Berthon and Kevin Ceccon in this weekend's season opener at Sepang, although the duo are only confirmed for Malaysia at present.
Neither was able to take part in the GP2 winter tests as they worked to put budgets together for 2013.
"I know I am not in perfect condition since I could not complete all the preseason tests, but I kept on working hard in case this would happen and it happened," said Berthon, who took 12th in last year's standings with Racing Engineering and claimed two podiums in sprint races.
"I feel more than ready and I am confident for this season because I have one year experience in GP2 under my belt, but also because I feel Trident is supporting me fully and they show me that they want to work and progress with me."
Ceccon contested several GP2 rounds in late 2011 in parallel with claiming the Auto GP title, before spending last year in GP3, where he was ninth in the championship for Ocean.
Trident last took a GP2 victory in Hungary in August 2011. Formula Renault 3.5 champion and Sauber Formula 1 reserve Robin Frijns was among the drivers it evaluated over the winter.
2013 GP2 lineup so far:
DAMS Marcus Ericsson Stephane Richelmi
ART James Calado Daniel Abt
Arden International Johnny Cecotto Jr Mitch Evans
Racing Engineering Fabio Leimer Julian Leal
Carlin Felipe Nasr Jolyon Palmer
Russian Time Tom Dillmann Sam Bird
Caterham Racing Ma Qing Hua Sergio Canamasas
Addax Team Rio Haryanto Jake Rosenzweig
Rapax Stefano Coletti Simon Trummer
Trident Racing Nathanael Berthon Kevin Ceccon
Hilmer Motorsport TBA TBA
Lazarus GP Rene Binder Kevin Giovesi
MP Motorsport Daniel de Jong Adrian Quaife-Hobbs