McLaren racing director Eric Boullier says he hopes to be able to make an announcement over who the team's 2015 drivers will be before the last race of the season.

Speaking in Singapore, Boullier had said McLaren's mind was "more or less" made up, and that he didn't foresee the situation dragging on beyond the end of the season. With just three races to go and Sebastian Vettel having announced in Japan that he will leave Red Bull - a move which is set to trigger confirmation of Fernando Alonso's departure from Ferrari - Boullier was asked if he still felt a decision would be confirmed within the next month.

"I hope to sort out our decision on the driver line-up before the end of the season, yes," Boullier said. "It's true that it takes a bit more time than maybe we have to deal with, but it's still on course to be announced and sealed before the end of the season, yes."

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With Alonso's availability leaving Jenson Button's future in serious doubt, Boullier said he understood why Button's demeanour may have been slightly negative despite recent strong performances.

"I understand that he may not feel comfortable and he is obviously concerned about his future. But again, unfortunately, I'm in charge of McLaren Racing and we have to build the best for the team and drivers are obviously very important for our discussion.

"Jenson is more than considered to stay with us for the long-term, but we are still investigating what we want to do with our driver line-up once we have all the data in hand."