The Red Devils' stand-in manager admits that he lost sleep over his team selection but praises the Spaniard, who started on the bench against Norwich City, for his mentalityRyan Giggs says that Juan Mata delivered a "masterclass" during his 30-minute display in Manchester United's 4-0 win over Norwich City on Saturday.
The Spaniard started as a substitute during Giggs' debut as United's stand-in manager but came off the bench to score twice after Wayne Rooney had put last season's title winners two goals in front.
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"That was a tough one, as it was leaving so many players out," Giggs told reporters.
"[Mata] was disappointed [not to start] and I'd expect that. It would be strange if he wasn't but he just showed the class that he's got both as a player and as a professional.
"He put on a half-hour masterclass, he was brilliant and I was really happy for him because it's not easy because he's got a big price tag.
"To not start the game was disappointing for him and I'm really pleased that he came on and made such an impact."