Giedo van der Garde says prospective 2014 team-mate Heikki Kovalainen "didn't bring as much as we expected" in 2013.
It was a case of 'mission accomplished' for Heikki Kovalainen on day one of his stint as Lotus's super-sub in Austin.
Heikki Kovalainen is confident he can help Lotus make ground in the constructors' standings after his late call-up.
Heikki Kovalainen will stand in for Kimi Raikkonen at Lotus for the final two grands prix of the 2013 season.
Reports in Finland suggest Heikki Kovalainen is poised to replace Kimi Raikkonen at Lotus for Austin and Brazil.
Heikki Kovalainen thinks he has a "good chance" of returning to the Formula 1 grid in 2014.
Heikki Kovalainen will return to Caterham's CT03 for two more appearances in Practice One sessions at Spa and Monza.
Heikki Kovalainen says Caterham should be beating Marussia even without the update package planned for Barcelona.
Heikki Kovalainen has no plans for a race return, even though he will practice for Caterham in Bahrain and Spain.
Caterham have confirmed that Heikki Kovalainen is to rejoin as a reserve driver and will practice in Bahrain and Spain
Cyril Abiteboul admits Caterham's relationship with Heikki Kovalainen was damaged as a result of a failure to deliver.
Heikki Kovalainen admits he does not know if he will be on the F1 grid next year - with his Caterham futre in doubt.
Heikki Kovalainen is confident the U.S. GP will prove a success because the sport now 'knows how to put on a show'.
2013 hopeful Giedo van der Garde will be given another opportunity to impress at Caterham during Practice One in India.
Heikki Kovalainen is hoping a new front wing will help Caterham edge closer to the midfield in Singapore this weekend.
The drivers give their reaction to qualifying for the Belgian Grand Prix, where Jenson Button took his first McLaren pole position.
The drivers give their views on a frustrating day in Belgium, where both sessions were heavily affected by rain.
Heikki Kovalainen is pinning his hopes on major upgrades from the newly relocated Caterham team to help break into the midfield.
Heikki Kovalainen is confident Caterham will be more competitive at this weekend's German Grand Prix at Hockenheim - if they understand their updates better.
Heikki Kovalainen is cautiously optimistic ahead of a British GP that sees Caterham looking to build upon progress made in Valencia.
The inside word from the world of Formula 1
Interact with us on our official Twitter account
Connect with Sky Sports F1 today
Watch Sky Sports F1 with a Day or Week Pass
The essential times you need to know