Rosberg: Wins 'impossible' for McLaren in 2015
That is the claim of Alain Prost, who won three of his four world championships with the British team, including his Honda-powered win in 1989.
But the diminutive Frenchman told Spain's EFE news agency that Alonso cannot expect immediate success.
"It is a new project with a new engine," said Prost, now 60.
"I think the situation we are seeing now at McLaren is normal," he added.
"Of course you want to be at the right place at the right time, but if he is happy, then there's no problem."
Asked how long he thinks it will take McLaren to reach the front of the grid again, Prost answered: "I don't know -- nobody does.
"But it may be faster than we think, although winning the world championship will be another step again that takes even longer."
"This season it's impossible for Alonso to be fighting for wins," Rosberg insisted.
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