Lotus F1 boss Eric Boullier has insisted that Kimi Raikkonen will receive all his outstanding salary in due course, despite the Finn revealing on Thursday that he hadn't been receiving his contractual fee on time in 2013.

"The reasons why [I haven't been paid] you will have to ask from the team, but the reason why I left the team is purely from the money side - the thing is, I haven't got my salary," he told reporters in Singapore this week.

"It's an unfortunate thing but I want to try to help the team as much as I can," he added. "I like to race, that's the only reason why I'm here and it doesn't matter what team it is," he said.

Boullier insisted that while the team did owe Raikkonen outstanding wages, the money would be paid before the end of the year.

"The truth is yes we owe him money so that is true, he is going to be paid, that is true too," the team principal responded on Friday. "So if you want a little bit more story, last year was the same... we owed him some money but only at the very end was he fully paid."

Boullier added that "it is just the way we manage our cashflow" and nothing to get concerned about regarding Lotus' overall financial viability.

"Unfortunately, we are not as rich as some of the teams on the grid," he said, adding that while Lotus had been capable of fighting for wins and podium positions alongside the likes of Red Bull and Ferrari, "maybe we are not as sustainable as we should be."

Boullier insisted that while he wasn't happy for Raikkonen to publicly reveal the situation over unpaid back pay, he didn't think it would harm the team's standing as it seeks a replacement driver for the Finn who is departing for Ferrari at the end of the season.

"I don't think it is damaging the brand of the team to be honest," he said. "It's obviously a bad message, but I don't know why he decided to publicly speak about his finance situation.

"We have not hid anything, we are trying to bring some new investors on board which would allow us to secure some new sponsorship and this is where we are nearly, nearly done," he said. "It's not a good message, it's true, but this is the reality and I think people need to face the reality."

Boullier added that this didn't mean the team would have to seek a pay driver in its 2014 line-up.

"We now want to have more finance, more sponsors because we need to step up and guarantee some stability over a few years," he explained. "That's part of the strategy, this is what we are still working on and we need to deliver on that point.

"We see the timing was not the right one for Kimi but we still have to deliver this," he added. "That would then allow us to chose drivers on merit which is obviously the first choice.

"Two years ago nobody would gamble on Kimi and we did it. Obviously we would have loved to carry on this story because the last two years was a nice story between Lotus F1 Team and Kimi Raikkonen," Boullier admitted. "We would have loved to carry on but this is life and so now we have to bounce back and actually make sure he's going to regret to have left us."