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 pre-season 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 line-up 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