There is added pressure on Jenson Button and Kevin Magnussen as Eric Boullier has said he will "wait" to finalise McLaren's 2015 line-up.
McLaren have long made it known that they are in no hurry to decide their driver line-up for next season.
This year the Woking team went with the experienced Jenson Button and rookie racer Kevin Magnussen. The partnership, though, has as yet failed to produce the results McLaren desire.
This has led to rumours that Button's days at Woking are numbered with the likes of Valtteri Bottas being linked to his race-seat while McLaren are also believed to be considering re-signing Fernando Alonso.
Boullier, though, says he is no hurry to make a decision and will rather wait to see how the driver market plays out.
"If any driver becomes available on the market, we will be interested to see if they fit," the McLaren Racing Director told Autosport.
"Our strategy, and I am not going to say we are going to change drivers, is we are in a position to wait.
"So we are going to wait until I understand what is going to be the driver market, not only for next year but also in the future years.
"The plan is to build McLaren for a long term at the top, and we need to know what we are going to do in three, four or five years."
Good news for Button, though, is that Boullier believes the 2009 World Champion is doing a "good" job.
Boullier added: "He is doing a good job. We want our drivers to give 100 per cent all the time.
"We want everybody to perform and, when you cannot get the performance you wish, it is sometimes difficult to accept it and you get frustrated.
"But it is the same for everybody and we need to push 100 per cent."
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