Graeme Lowdon and John Booth will leave Manor Marussia Formula 1 Team at the end of the 2015 season after tendering their resignations.
Following the collapse of the old Marussia F1 Team at the end of 2014, sporting director Lowdon and team principal Booth were instrumental in getting the operation on its feet once again and eventually back on the grid for this season.
However, both lynchpins are now poised to leave Manor at the end of the season, after resigning from their roles, as confirmed by sources to NBC Sports.
Lowdon and Booth have become disillusioned with the running of Manor by British businessman and owner Stephen Fitzpatrick, whose investment allowed the team to get back onto the grid in 2015.
The team has gone from strength-to-strength in 2015, going from a blank car and race suits in Melbourne to the arrival of new sponsors, plus technical deals with Mercedes and Williams for 2016.
Manor is also the only team with any seats remaining for 2016, which have been subject to a great deal of interest from a number of drivers who could bring finance to the backmarker outfit.
However, the loss of Lowdon and Booth – who have both been with Manor since it debuted in F1 as Virgin Racing back in 2010 – will raise serious concerns about the long-term future of the team, particularly with Fitzpatrick’s leadership triggering their resignations.