Jarno Trulli has hit out at the influence of pay drivers on the F1 grid as the rumour mill suggests his drive with Caterham could be at risk.

Despite being announced with the team for a third straight season, and with a contract in place for 2013, speculation has suggested that Trulli's role with Caterham could be at risk - with Vitaly Petrov one driver having been linked to his seat in recent weeks.

Speaking in La Repubblica. Trulli hit out at the trend of teams bringing in pay drivers to help with budgets, arguing that they lacked commitment and didn't provide a team with the best chance of results on track, citing former team Renault as an example.

"Robert Kubica is a great driver who can get the very best from the car," Trulli told La Repubblica. "Because of that they [Renault] were a dark horse. When Robert was out, that was the end. Petrov was not in a position to lead the team, and Senna showed that he was not good enough.

"With his experience, Nick [Heidfeld] scored almost as many points as Petrov even though he did only half the season. There is no rule, but it is true that those who pay are less accustomed to suffering. They are less committed.

"Hiring them is a business decision but in my opinion it's not worth it."