Jenson Button says McLaren are "nowhere" at the moment and have "a lot of work to do" tonight after a dismal showing in practice on Friday for the Brazilian Grand Prix.

Button only managed an installation lap in FP1 this morning, before his car ground to a halt with an ERS problem.

He then did 31 laps in the afternoon, but was a lowly 16th on the times, his best effort a 1 minute 14.209 seconds, which left him over 2 seconds off the pace, and just over seven tenths off team-mate Kevin Magnussen in P10.

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"It was a bit of a pain [to miss FP1]. I didn't get any laps in apart from an install lap. We had a problem with the ERS unit, but all replaced and all okay this afternoon," Button said. "It is quite different driving around here now. They have changed the circuit a lot with the new asphalt, which is a shame."

"We have got some things that we are trying out on the car that has been different for quite a few races and it is not working," he added, when quizzed on why he was so far down the times.

"It is good to know though, and I know that it is wrong in many different ways. At least we know where to go with the set-up, which is positive.

"I think the only thing that we find quite strange is that our maximum speed is so far off. We are not running that different in terms of downforce levels and we would struggle to go that speed in a straight line. We would have to take the wings off [to get that speed]. It is something we need to solve because it is a lot of time that we are losing on the straights.

"We have a lot of work to do tonight, but I think we understand where the issues are and hopefully we can resolve it for tomorrow."

So what can he do on Saturday?

"Tomorrow looks like it is going to be much cooler and probably raining, which will mix it up again. It is important for us to get it right in terms of the dry set-up, however, because the forecast says Sunday is probably going to be dry. So, even if qualifying is wet, we need a dry FP3 really because at the moment we are nowhere," he warned.

"If we are where we are now tomorrow it won't be very good, but the car is definitely better than this. We have just got to maximise what we have."