Sep.19 (GMM) Jenson Button has confirmed that the sticking point in his talks with McLaren is over 2015.
It has been reported the 2009 world champion is happy to commit to the British team for next year, but wants to leave the door open for 2015.
"For next year it's all good, it's a formality," Button is quoted by the news agency AFP.
"We've shown in the past that we weren't afraid to make the changes that we felt that we needed to in the team, whether it was inside the organisation or in the driver lineup, in order to get the job done," he told a Vodafone teleconference.
Button hinted at an ExxonMobil promotional event ahead of the Singapore Grand Prix that 2015 is the sticking point.
"Nothing's sorted yet for the year after," he said, referring to 2015.
"2014 is an option year on the previous contract and then we see."