Alonso undecided about F1 future - Brown

Zak Brown has admitted that Fernando Alonso might not race an orange car in Formula 1 next year.

Spaniard Alonso won Le Mans recently, and he now wants victory at the Indy 500 to complete the elusive 'triple crown'.

'Fernando still has to decide'

At the same time, he is obviously disenchanted with his lack of a competitive car and the overall situation in F1

READ: Alonso to Ferrari rumour swirls in Monaco

"Fernando still has to make a decision.

Brown, the McLaren executive, said: "We have a very good relationship with him, he has been with us for quite a long time now and ultimately it depends on what and where we will compete and how our F1 car develops.

"I'm optimistic that Fernando will stay in the family and in the formula one car. As long as he feels we can take a step forward, I think F1 is something he would like to continue doing." 

McLaren, though, had a dire weekend in France and was among the slowest cars in the field.

"It was our worst performances of the season and I hope an isolated case. We have a lot of work to do in the next two weeks," said team boss Eric Boullier.