Marussia has confirmed German driver Timo Glock is leaving the team ahead of the start of the 2013 Formula 1 season.
Marussia said they had agreed to part company by mutual consent.
Glock had joined the team when it made its F1 debut at the start of the 2010 season, and he had extended his contract until the end of 2014.
The team has failed to score a point in F1 and lost the vital 10th place in the constructors' championship to Caterham in the final race of 2012 season in Brazil.
The news means Marussia will need to find another driver to race alongside rookie Max Chilton.
The team said it will announce its final line-up in due time.
2013 Formula 1 line-up so far: Red Bull Sebastian Vettel Mark Webber Ferrari Fernando Alonso Felipe Massa McLaren Jenson Button Sergio Perez Lotus Kimi Raikkonen Romain Grosjean Mercedes Lewis Hamilton Nico Rosberg Sauber Nico Hulkenberg Esteban Gutierrez Force India Paul di Resta seat still available Williams Pastor Maldonado Valtteri Bottas Toro Rosso Daniel Ricciardo Jean-Eric Vergne Caterham Charles Pic seat still available Marussia Max Chilton seat still available