McLaren have changed their test plan with Jenson Button back in the car on Thursday
Rookie Magnussen to take over the MP4-29 in the afternoon
By Mike Wise
Last Updated: 29/01/14 6:45pm
The team's original intention had been for Button to drive on the opening two days in southern Spain before handing over to his new team-mate Kevin Magnussen.
However, McLaren suffered teething troubles with their MP4-29 on Tuesday, meaning that Button failed to complete a solitary lap. The 34-year-old will now complete his week's work on Thursday morning before rookie Magnussen tries the car for the first time.
Good day today. But as we did no running yesterday, @JensonButton will do tomorrow a.m. & I'll do tomorrow p.m. & all day Friday.- Kevin Magnussen (@KevinMagnussen) January 29, 2014
McLaren and Button enjoyed a far more productive day on Wednesday, finishing top of the timesheets after completing a total of 43 laps.
Speaking to Sky Sports News afterwards, he said: "You always want to do more laps. This is really our first day of testing - yesterday was a no-show really. I think that we're getting a good understanding of things in terms of the car, the way the engine is behaving and the turbo; obviously it's very different to what we're used to.
"There's a lot of work needed but it's all stuff that we can work on now. There's nothing that scares me with the car; there's a lot in terms of set-up that we can do, it just takes time. And in terms of how the engine behaves as well - under braking and traction: all those areas we're going to have to work a lot on.
"But it's exciting, because there's a lot we can play with and a lot we can adjust. The brake system is very complicated, so getting it right is tough and today we've had a few moments where you end up locking up and almost finding the gravel.
"So it's tricky, but it's enjoyable to drive. I have to be honest: it's doesn't sound like anything I've driven before in terms of an F1 car. I love the roar of a V10 and a V8 but this is what we have, and I think as long as we have good racing, the fans will still love it."
Scheduled Jerez Day Three line-up:
Caterham: Robin Frijns.
Ferrari: Fernando Alonso.
Force India: Nico Hulkenberg.
McLaren: Jenson Button/Kevin Magnussen.
Mercedes: Lewis Hamilton.
Red Bull: Daniel Ricciardo.
Sauber: Adrian Sutil.
Toro Rosso: Jean-Eric Vergne.
Williams: Felipe Massa.
The Sky Sports F1 Online team will be providing live commentary of all three winter tests, with live updates from trackside also on Sky Sports News.