Another pair of goals in Saturday's FA Cup victory over Fulham took Chicharito's personal haul to 14 this season, making him second only to Robin van Persie in the Reds' scoring charts.
"He got a break in the summer, got the little rest and that's shown the benefit," Sir Alex told MUTV. "It's a terrible dilemma when I've got that lad there. Sometimes I leave him out to bring in Robin van Persie, but as I explain to him, we regard him so highly.
"He's a fantastic professional, unbelievable attitude to the game, never stops running or working and every training session's the same, so I'm really pleased for him and it's good to see Wayne back scoring."
Comparisons continue to be drawn between the Reds' current attacking roster and 1999's Treble-winning quartet of Andy Cole, Teddy Sheringham, Ole Gunnar Solskjaer and Dwight Yorke, and Sir Alex rates his modern crop just as highly as their forebears.
"The four in '99 were fantastic players," he said. "You couldn't possibly criticise any of them, they were fantastic, but we've got four players today who are equally as good."