Jordan King will retain his development driver role at Manor for the 2016 season, the team confirmed on Tuesday.
The GP2 driver will split his time between his development role with Manor and his full-time GP2 race seat with Racing Engineering this year.
The Briton tested for Manor at the post-season Abu Dhabi test last year and impressed team boss Dave Ryan.
"I was at the Abu Dhabi test where Jordan drove our car for the first time and he did an impressive job," Ryan said. "It was clear that he’d taken full advantage of the opportunity to get under the skin of the team and understand the systems, processes and people.
"Over the winter months he helped us to refine driver installation with the new chassis, pending the signing of our race drivers, so the development driver role really is mutually beneficial. We look forward to having him around the team and wish him a successful season in GP2."
King added: “I racked up 300km in that test and loved every second in the car. But what I want to do now is race one and I’m flat out working to achieve that.
“Continuing in the development driver role with Manor Racing is key to that progression and I’m excited to be working with Dave Ryan, Pascal and Rio for the first time, as well as the guys I’m more familiar with.”