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The club's record appearance holder knows it is imperative to get off to a good start in August if they are to regain the crown. Rooney, Michael Carrick, Nemanja Vidic, Patrice Evra and Ji-Sung Park are all absent from United's five match summer tour, beginning with a match against Celtic on Friday. Giggs said: "It is always difficult after a World Cup because the players who have been involved in the tournament have time off. "You just hope there is no hangover from the World Cup and everyone can hit the ground running. Hopefully our players will come back refreshed and we can get off to a good start." Rooney and company are due to return 12 days before the Community Shield match against Chelsea on August 8. And manager Sir Alex Ferguson believes Rooney will soon shake off the frustration of his World Cup performance. Ferguson told sportsnet.ca: "I don't expect a hangover. I think there'll still be a bit of disappointment in the lad. "I think all the players coming back from the World Cup who didn't do well, who didn't reach their expectations may I say, will feel that they've missed something. "That's because the World Cup's only once every four years. That's the horrible part of that tournament. "We have several players who have come back very, very disappointed. We've Patrice Evra for instance, Wayne Rooney of course, and Nemanja Vidic." With Vidic absent and Rio Ferdinand injured, former Fulham defender Chris Smalling could be handed a run-out against Neil Lennon's side. Apart from Smalling, only Javier Hernandez has been added to the squad and former captain Bryan Robson is keen for some more additions. "I would like to see us bring in a goalscoring midfielder," he told manutd.com. "You look at the likes of (Steven) Gerrard and (Frank) Lampard who contribute so many goals to their teams. I think that's an area we need to improve on. "Having lost Ronaldo and Tevez last year I think one more striker would be a good addition too although Hernandez certainly looked promising at the World Cup. "Although he didn't get a lot of time on the pitch, he looks like he's got some good movement, nice touches and an eye for goal. It'll be interesting to see how he performs on the tour." The 22-man United squad were heading for Toronto later on Thursday after a four-day training camp in humid conditions in Chicago. In readiness for the match against Celtic, the artificial pitch at the Rogers Centre is being replaced by grass.
