Dutchman recently dismissed rumours former Caterham racer Kovalainen was set to replace him later in 2013.
Among the attendees were Bianchi, Chilton, Rossi, Kovalainen, Valsecchi, Gene, Button, Hamilton, Buemi, Rosberg and Perez.
Heikki Kovalainen says 'it's no surprise the team has not gone so well, when you're putting an old car against the new ones'
Former team racer Heikki Kovalainen will return to the cockpit this weekend in Bahrain.
The numbers of available drivers for the Marussia F1 Team vacant seat continue to grow. Both Heikki Kovalainen and Vitaly Petrov were teammates with the Caterham team.
Giedo van de Garde: Last year it was a little too dark, which sometimes didn't look good on TV.