Kevin Magnussen has said that he is not sure the controversial Halo device will ever be introduced in Formula 1.
More trials of the cockpit protection have taken place in Monza practice, and Force India's Sergio Perez said: "I have to admit the Halo does not interfere with visibility.
"But getting out of the cockpit took me five seconds more, which is a concern."
Renault driver Magnussen added: "If I had my way, we would not use it.
"I don't think it will come in, otherwise we would be having it for next year already. I think now they've delayed it, we'll come up with something better."
Lewis Hamilton will start on pole at tomorrow's Italian Grand Prix.
