American Alexander Rossi will race in GP2 with the Racing Engineering team, the Spanish squad has announced.
Rossi, a Marussia and Caterham reserve in Formula One during 2014, completes Racing Engineering's line-up alongside Briton Jordan King.
The 23-year-old Californian competed in six rounds of the 2014 GP2 series with Campos and Caterham, before parting company with the latter following a change of ownership of the F1 team.
Rossi, a one-time race winner in GP2, had tested for the team in 2010, but this will be his first year racing with it.
"After several years of discussions, at last Racing Engineering and I have found a way to work together," said Rossi.
"Racing Engineering is a multiple championship winning GP2 team, and their passion and commitment to excellence reflects throughout the organization, where winning and performance is the sole focus.
"After my 2014 season as the Official Reserve Driver at the Caterham and Marussia F1 Teams, it is public knowledge that I have been carefully looking over several options for 2015, both in Europe and the States.
"I've spent the majority of my career racing in Europe, building my racing foundation and have strong relationships there. My ultimate goal has never wavered, and still remains F1.
"The GP2 Championship with Racing Engineering is the perfect alignment for these career objectives."
Rossi will join Racing Engineering for the first pre-season test in Abu Dhabi next moth.
"We have known Alex for many years and our paths have often crossed but not come together but now that we are working together the driver and the team will do everything in their power to achieve the goal we have set," said team boss Alfonso de Orleans.
"With teammate Jordan King, we have a formidable line up for the 2015 season, now let's get to work and make it all happen."