McLaren will delay a decision on whether Fernando Alonso will return to the cockpit for the opening round of the 2015 Formula 1 World Championship season opener until nearer the time following his crash in pre-season testing.

The Spaniard spent three nights in hospital following the crash at the Circuit de Catalunya, but while Ron Dennis confirmed there was a period of unconsciousness suffered, he is otherwise 'physically perfect'.

Even so, with Alonso missing the final pre-season test, McLaren says it will defer the decision to put him back in the car for the Albert Park opener to doctors. Despite this, Dennis says he expects he will be back alongside Jenson Button.

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"I can't forsee any reason why not but I'm not the doctor," he said. "There will be some tests, there is a process laid down within the FIA and I can't see any reason why he just won't sail through it. It's not for me to say yes or no.

"In normal circumstances, if it was a Grand Prix, he would probably be racing. I am just saying that there is no point in being here [testing], going through a recovery. He will appear in Australia and he will go through the FIA [medical] test at some point."

In the meantime, Kevin Magnussen has been called up to substitute for Alonso at the final F1 test of the pre-season, with Dennis suggesting his presence here is to give him a shot in the car in case he is called up to race.

"I am not sure how things will unfold the rest of the four days, but effectively if Fernando didn't drive then Kevin would. It is the sort of preparation you would expect us to take to cover all eventualities, as opposed to this being right up there."

Magnussen is scheduled to drive the car on Friday, though McLaren may choose to alter the schedule after Jenson Button managed just seven laps in the car today before a hydraulic leak forced the team to cut short its