Swiss says he was signed as Manor's reserve driver with the proviso it would try to give him a full-time drive at the end of the current season.
Will not attend the two days of testing at Red Bull Ring on Tuesday and Wednesday due to the cost implications.
Team denies Merhi is on borrowed time at the team despite his race-by-race contract and the arrival of 2013 GP2 champion.
Romain Grosjean took the blame and two penalty points for his collision with Will Stevens at the Canadian Grand Prix.
Swiss driver, who won GP2 championship in 2013, set for FP1 appearances this season.
Former Mercedes technical director Bob Bell has joined backmarkers Manor as a consultant for the remainder of the 2015 season as the team aims to strengthen its engineering team.
An investigation has concluded that no action will be taken against the Marussia Formula One team in relation to Maria de Villota's accident during a straight-line test in 2012.
Philippe Bianchi says family 'have to think about death' despite the fact they are still hopeful of a miracle with son Jules.
Team releases wristband with words 'Monaco 2014. P8. #JB17' to honour Bianchi's historic result at Monte Carlo last season.
Team returns to the scene of Jules Bianchi's points finish last season as the Frenchman remains in a coma following his crash at 2014 Japanese Grand Prix.
Manor is targeting the Belgian Grand Prix for the debut of its updated 2015 car.
ESPN rounds up all the reaction from up and down the paddock after the Bahrain Grand Prix
ESPN rounds up all the reaction from up and down the paddock after qualifying for the Bahrain Grand Prix.
German pips Lewis Hamilton to P1 as Mercedes shows it has still maintained one-lap advantage over Ferrari.
ESPN rounds up all the reaction from up and down the paddock after qualifying for the Chinese Grand Prix
World champion tops his third practice session of the weekend as Mercedes shows its one-lap advantage over Ferrari in China.
All the reaction from up and down the paddock after Friday practice in Shanghai.
ESPN rounds up all the reaction from up and down the paddock after the Malaysian Grand Prix
A look at the main talking points ahead of the Malaysian Grand Prix as F1 looks to bounce back from a damp squib in Melbourne
Car yet to run this weekend despite miraculous winter turnaround
The latest betting tips from the ESPN team, in association with bet365
ESPN UK is looking to discover which city in the UK is the best place to be for sport - and we need you to help us.
Watch every fixture from March Madness LIVE and on-demand with ESPN Player. Available across Europe, subscribe today.
Save 10% off your first order in the ESPNscrum shop. Replica international and club jerseys, official balls and more.