MONZA, Italy -- Renault's Kevin Magnussen expressed his doubts the Halo safety device will ever be implemented in its current guise after tests continued at Monza.

The FIA is keen for every driver to sample the structure on track so it can collect feedback ahead of its implementation in 2018 after introduction for 2017 was ditched. Magnussen thinks there will be a better option on the table by the time a decision needs to be made on cockpit protection and 2018.

Asked about whether the Halo came up in the Friday drivers' briefing, he said: "I think it's the plan for most teams to run it at some point, isn't it? If I could choose I'm not going to run it. I don't think it will come in... I don't think so. I think now they've delayed it they will come up with something better.

"They need to come up with something better. The Halo isn't going to go on. If it was then it would come on next year. They've obviously seen that they can come up with something better and they need more time to do it."

Magnussen thinks the current idea of testing the Halo in the public eye might be counter productive.

"I don't know if it's better to have outside the public eye. It would probably be a quicker process to have it running all the time but you can't really have that in a season. We'll see how they get on.

"The FIA should have a car in a way, testing it, but that would be very expensive. Pirelli should have a car testing tyres and that would be very expensive as well..."

Jenson Button, Magnussen's former teammate, was one of the drivers to sample Halo on Friday and reported the only real issue came when straining his vision for a braking zone.

"It was Ok. No major issues with it. I think the start lights and maybe the pit stops could be a bit more difficult, to see the lights, but there's so many possibilities of moving stuff around and what have you.

"It's a little bit strange, because when you're doing 200 mph and you're trying to focus straight ahead of you, you're focusing on what's dead in front of you... makes you a bit cross-eyed!"