Despite making a pre-tax loss last year of £2.5, team principal Martin Whitmarsh told The Observer that any financial issues would not affect any move for the Spaniard.
He said: "In all probability for 2014 the die is set but who knows in the future.
"I shouldn't be stoking wild rumours of his return in 2014 but would we welcome him back, be delighted to have him back in the team? Of course we would."
McLaren are currently on course for their first winless season since 2006.