United boss David Moyes has repeatedly insisted Rooney is not for sale after Chelsea boss Jose Mourinho expressed his admiration for the striker, sentiments Hazard echoed in Bangkok on Monday.
"Rooney would be a brilliant signing," Hazard said. "He's a great player who has the experience and he's still only young, at 27. He's got a few years left to play. But it's not up to me. It's not my decision."
Further signings are expected at Chelsea this summer after the arrivals of Andre Schurrle, Marco van Ginkel and Mark Schwarzer.
Mourinho is such an admirer of Hazard that he once tried to sign the Belgian from Lille when he was managing Real Madrid.
"He told me he'd asked Lille, but I wanted to stay there until I was 21 and develop my game," added Hazard, who moved to Stamford Bridge last summer. "I must have been 19 or 20 at the time. Real Madrid is a wonderful team, but I had so much still to prove in the French league. I stayed because I didn't want to leave too early."
Chelsea, the 2012 Champions League winners, won a trophy at the eighth attempt last term, but Hazard missed the Europa League triumph with a hamstring injury.
A first Barclays Premier League title for Chelsea since 2010 must surely be on Mourinho's agenda, but Hazard knows the Special One's arrival alone will not be sufficient to spur the Blues to the title.
Hazard added: "With him in charge, we win matches and claim trophies. His arrival is important certainly. But it won't be him who actually goes out there and wins the title. We have to concentrate on what he wants of us and, if we all give 100 per cent, we have a real chance of winning the title."
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