The former Manchester United manager, who revealed the striker handed in a transfer request in May, says the 27-year-old is "back to what we always remember"
Sir Alex's revelation in May that Rooney had handed in a transfer request sparked a summer-long saga in which the 27-year-old pushed for a move to Chelsea.
| MANCHESTER UNITED LATEST
|25/1||Wayne Rooney is 25/1 with William Hill to be Premier League top scorer
Rooney netted twice in United's Champions League group-stage victory over Bayer Leverkusen on Tuesday and Sir Alex believes the forward has recaptured the form of his best years at Old Trafford.
"I thought Wayne was fantastic [on Tuesday]. He's got his energy back, his determination, his purpose to attack," Ferguson told MUTV.
"Being a director, I'm delighted to see that. He's back to what we always remember."