Ryan Giggs has backed Wayne Rooney and Adnan Januzaj to take the 2014 FIFA World Cup Brazil™ by storm. Rooney will miss a third successive game for Manchester United due to a groin problem, although Giggs is sure the England forward will be fit enough to go to the World Cup.

But while Rooney is a household name opposition teams will be well aware of, Januzaj is something of an unknown threat. The 19-year-old may have had a good season with United, but he is yet to earn an international cap. The midfielder only pledged his allegiance to Belgium - the country of his birth - last month.

David Moyes used Januzaj sparingly towards the end of his tenure as United boss as he feared the teenager would break down due to exhaustion. But Giggs has no qualms about Januzaj heading to Brazil with his new international team-mates this summer.

"Adnan is the kind of player who could light up a World Cup, whether that is starting games or off the bench," said the United interim player-manager, who started Januzaj in the 3-1 win over Hull on Tuesday. "I was excited when he got the ball the other night - when I was on the pitch and on the bench. He floats with the ball effortlessly. He is just one of those players you love watching."

Belgium are outsiders in the running for World Cup glory, but with the likes of Eden Hazard, Romelu Lukaku, Januzaj and Simon Mignolet - who have all impressed in the English Premier League this season - among their ranks, they have the potential to reach the latter stages.

He floats with the ball effortlessly. He is just one of those players you love watching.

Ryan Giggs on Manchester United team-mate Adnan Januzaj

England will hope to reach that stage in the tournament too. And they will rely heavily on Rooney to get there. Rooney is England's most dangerous player. His power, pace and eye for goal will worry Italy, Costa Rica and Uruguay, who make up Group D. But the fact remains that the 28-year-old has yet to live up to his billing on the global stage.

Rooney's previous two World Cup campaigns have been hampered by injury, and hie best international tournament came ten years ago, when he burst onto the scene at Euro 2004. Giggs is sure Rooney can be a leading star for England this summer though. "Wayne is at the peak of his powers," said Giggs, who has played alongside Rooney for ten years. "Wayne is a top player. He is at a good age. I know for a fact he can't wait for it. He has had a fantastic season and he is ready to make an impact."

Rooney broke a metatarsal in April 2006, limiting his impact at the World Cup in Germany and four years later he suffered an ankle injury just before the tournament in South Africa. The former Everton striker recently had a spell out with a toe injury and he now has a groin complaint.

The injury will not stop the striker scoring goals at the World Cup, according to Giggs, who is also confident that Phil Jones will be named in Roy Hodgson's 23 on Monday despite a shoulder injury. "Wayne will be fine for the World Cup," Giggs said. "It was just a little groin strain. He is fine. He has done all the work in the gym. He trained yesterday. He will be fine. He is going away next week and working on his fitness as well so it has probably helped him. The injury has probably done him a favour."