On his return to club duty he opened the scoring against West Brom, had three further efforts saved by Baggies keeper Scott Carson and also laid on goals for Cristiano Ronaldo and Nani.
Referee Mark Halsey also ruled out what appeared to be a perfectly good goal from the England striker for a foul on Gianni Zuiverloon.
"Wayne did have a hand on the lad's shoulder but he did not pull him," said manager Sir Alex Ferguson. "You can see it from the TV replays but obviously the referee does not have that advantage."
Ferguson believes Rooney, who turns 23 on Friday, is still some years away from his peak.
ROONEY'S MAN UTD GOAL TALLIES
04-05: 17 (0 for England)
05-06: 20 + 1 for England
06-07: 23 + 1 for England
07-08: 18 + 2 for England
"Wayne is only 22," said Ferguson. "We expect him to improve, as we did with Ronaldo. But he is a member of the team, just like everyone else."
The only downside for United on Saturday was a hamstring injury that forced left-back Patrice Evra to depart in the first half.
The Frenchman is now a doubt for Tuesday's Champions League vist of Celtic to Old Trafford.
The two sides also met in the group stages two years ago, when United won 3-2 at home but lost the away leg 1-0 at Celtic Park.
"It was a great atmosphere both times so I am really looking forward to playing them again." Rooney added. "I am sure our fans will be up for it and the players certainly will be.
"They had one of the most hostile atmospheres when we played them there, and hopefully we can return the favour and make it a really hostile night at Old Trafford. I am sure we will give the fans a really good performance."
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