Kimi Raikkonen says that financial issues triggered his departure from Lotus.
Raikkonen told reporters in Singapore that he has not received his salary from the team.
The 2007 world champion has raced for Lotus since the start of 2012 but will switch to Ferrari for next season.
“I like to race, it’s the only reason why I’m here and it doesn’t matter [with] which team,” Raikkonen said ahead of the Singapore Grand Prix.
“The reasons why I left the team is purely on the money side and I haven’t had my salary. It’s unfortunate.”
Raikkonen also said that Lotus know what they could have done if they wanted to retain his services next season.
“There was a lot of things and for sure they know what it is. It’s hard to say which way it would have gone if that had happened but the [Ferrari] deal is done now and I’m happy.”
The Finn also sees no reason why he cannot enjoy a productive relationship with future team mate Fernando Alonso.
“I don’t see a reason why it wouldn’t work.”
“We’re old enough to know what we’re doing and the team is working for the right things. If there’s something I’m sure we can talk it through, it’s not like we’re 20 years old anymore.”
“It will be a hard fight on the race circuit but I’m sure we’ll be ok.”
Raikkonen added that he does not think he will have difficulty in adapting to racing for Ferrari again.
“I know the team, I know the people, obviously there are some new people and some have left since I was there,” he said.
“I don’t think it will be too difficult to go there and do well. The car is different, and the most difficult thing is the  cars are different. Whoever makes the best car will make the best of it.”