Manor Marussia founders and team bosses Graeme Lowdon and John Booth have reportedly handed in their resignations, effective from the final race of the season in Abu Dhabi.
The pair worked tirelessly to get Manor back on the grid in 2015 after the outfit faced financial collapse at the end of the 2014 season.
Investor Stephen Fitzpatrick, of Ovo Energy, stepped in to provide financial backing, allowing the pair to prepare a 2015-spec car and secure a year-old Ferrari engine deal.
They have continued to push forward with plans for 2016, including a Mercedes engine deal, which could see the team become a midfield contender.
However it’s believed they have grown unhappy with the direction Fitzpatrick is taking the team, with Motorsport reporting that Fitzpatrick has declined financial support from outside investors interested in buying into the team.
Both Lowdon and Booth are keen to secure extra investment to ensure the team can realise its potential, something they have questioned under Fitzpatrick’s sole ownership.
They refused to comment on the speculation when questioned in Mexico.