Wayne Rooney and substitute Juan Mata scored two goals apiece as the faltering English champions, still a relatively lowly seventh in the table, proved too strong for the struggling Canaries.

United great Giggs, previously a player-coach, was put in caretaker charge for United's final four games of the season after David Moyes was sacked on Tuesday.

Moyes was dismissed just 10 months since replacing the retired Alex Ferguson after a 2-0 defeat by Everton -- Moyes's former club -- made it mathematically impossible for United to qualify for next season's Champions League.

The 40-year-old Giggs, English football's most decorated player, resisted naming himself in either the starting line-up or on the bench against Norwich.