Highlights - European Grand Prix
Brazilian driver Bruno Senna has been dropped by his Spain-based Hispania team for this weekend's British Grand Prix at Silverstone.
"The drivers are Sakon Yamamoto and Karun Chandhok," said Hispania principial Colin Kolles, referring to the team's drivers for the British GP.
Hispania have yet to come anywhere near to scoring a point this season.
Senna, nephew of the late great triple champion Ayrton, signed for Campos in 2009 before it was rebranded Hispania.
The 26-year-old's manager Chris Goodwin dismissed claims that the Brazilian had been sacked as "absolutely ridiculous".
A spokeswoman for the governing body FIA confirmed that India's Chandhok and Japanese test driver Yamamoto had been entered for the weekend and not just Friday's practice.
Yamamoto started 14 races in 2006 and 2007 for now-defunct Super Aguri and Spyker, then run by Kolles, without scoring a point.
Senna has been classified in only three of his races so far, with his 16th-placed finish in Malaysia and China his best result this season.
At the most recent European Grand Prix in Valencia, Senna and Virgin Racing's Timo Glock were called to the stewards after they collided while fighting for position in the race.
Senna, who made his F1 debut at in Bahrain this season, finished runner-up in the GP2 support series in 2008 and started on pole at Silverstone in that championship as well as in Formula Three, but this weekend will be kicking his heels.
Kolles would not say why the Brazilian had been dropped but the team is due to issue a statement on Friday.
Hispania are one of three new teams this season and after not scoring a point they are understood to be fighting a battle for finances as well as one on the track.