London, July 26 : Ace striker Wayne Rooney has warned Manchester United's rivals that they will storm into the new season believing they are the best team in the world.
The England striker feels that last season's double win has given the Red Devils an extra spring in their step ahead of the new campaign.
And that spells bad news for the rest of the big four who will be looking to prevent Alex Ferguson's men making it three Premier League titles in a row, The Sun reported.
Rooney, 22, said: "After our success last year there will be high expectations but we've got a good enough squad and hopefully we can emulate last season.
"Of course winning trophies brings you confidence and we're a confident team anyway. But it's given us that bit extra and belief that we're the best in the world. Hopefully we can prove that again this season," he said.
Rooney claimed that he is enjoying the feeling of being tackled again on United's tour of South Africa.
"They've been tough games but that's what we expected - the two teams we played wanted to leave an impression. It's better to get these games in so early. It's nice to get tackled again - the sort of things you're used to getting during the season," Rooney said.
"We've enjoyed it. It's good to get back, see the lads and get amongst it again. I can't wait. We have a few more good games and we'll be ready come the start of the season," he added.