It was an upbeat end to a turbulent week at Old Trafford that saw David Moyes dismissed just 10 months after succeeding Alex Ferguson, paying the price for taking the club from champions to seventh place.
However uplifting this rout was for disgruntled fans, it came against a relegation-threatened team with the worst away record in the league. And United did also score four goals in winning two of Moyes last three domestic fixtures.
Giggs has got all the credentials to be the next manager but thats down to the board, Rooney said.
The 40-year-old Giggs has grown up at Old Trafford, from coming as a supporter, rising through the youth team, becoming the clubs most decorated player, and now occupying the managers seat in the dugout
Its the rock, which my life has been built upon, Giggs said in the match-day program of the club. Having joked on Friday he would award himself a new five-year playing contract, Giggs denied himself a 963rd United appearance.
Watching from the sidelines in a club suit, Giggs ensured the team provided the cathartic experience desired by all at Old Trafford nearing the end of this season of unparalleled inferiority and disorder at United in the Premier League era.
Although there was never a mutinous atmosphere even in the lowest points of Moyes ill-fated reign, there has not been this much joy inside the ground for some time, supporters cheering loudly as Giggs emerged from the tunnel before kickoff. Fans inside the Theatre of Dreams will start dreaming again of a brighter future.
As if to emphasise the extent of the club moving on after Moyes, it came with Saturdays start. Marouane Fellaini, the 27.5 million-pound midfield signing which defined Moyes reign, didnt even make the bench and Mata, the clubs record 37.1 million-pound signing in January, was dropped from the starting line-up. Talented teenager Adnan Januzaj, who broke into the first team under Moyes, wasnt in the match-day squad.
The pre-match message by Giggs to the team was: entertain, attack, play with a tempo. But it was listless for much of the first half against a well-drilled Norwich side. It took more than 10 minutes for United striker Danny Welbeck to test goalkeeper John Ruddy.
Giggs will tear us apart, the fans chanted.
While Norwich lacked adventure going forward, United were thwarted again by goalkeeper John Ruddy, who blocked Antonio Valencias powerful strike. The breakthrough came after referee Lee Probert decided that Steven Whittakers contact before Welbeck fell merited a penalty.
Rooney scored from the penalty spot in the 41st minute to lift the atmosphere before halftime and he was on target again inside three minutes of the second half. The England striker drifted in from the left unchallenged before unleashing a shot into the bottom corner of the net while slipping.
Norwich only managed its first shot on target in the 59th, with Roberto Snodgrass free kick pushed away by goalkeeper David de Gea.
But United were cruising by this point after Matas arrival from the bench ensured the victory was even more convincing.
The Spain midfielder scored inside three minutes. It started with Rooneys long-range strike being parried by Ruddy, Valencia retrieved the ball, cut it back to Phil Jones and Mata completed the move by scoring in the 63rd. Mata nodded another over the line 10 minutes later after Valencia met Patrice Evras cross with a volley.
Van Gaal set for Devils
Louis van Gaal and Manchester United have agreed to the Dutch coach taking over as the club's manager next season once he has completed the World Cup in Brazil with the Netherlands, the De Telegraaf newspaper reported on Saturday. The Dutch daily said first talks between the parties began a fortnight ago, before the sacking of David Moyes, and that an agreement was reached on Friday night after talks with one of the Glazer brothers, club director Ed Woodward, and a club lawyer.
other results: Southampton 2 bt Everton 0, Fulham 2 drew with Hull City 2, Stoke 0 lost to Tottenham 1, Swansea 4 bt Aston Villa 1, West Brom 1 bt West Ham 0