The summer signing from Arsenal claimed a hat-trick in his third appearance for the club to join team-mate Wayne Rooney as the only players to have bagged a treble sooner into their United careers than Charlton.
The Old Trafford legend is enthusiastic about the Dutchman's arrival and is predicting plenty more goals from the ex-Arsenal attacker.
"We’re very happy to have Robin van Persie here," Sir Bobby stated in The Ambassador's Column for United Review. "You can’t possibly see him not scoring goals for us.
"He’ll do his chasing, he’s good in the air and he doesn’t think about it. When the goal is there, he doesn’t look up – take his goal against Fulham for example. The chance came to him and he just helped it on its way. Robin is a great goalscorer; that’s why Sir Alex [Ferguson] likes him.
"It’s just paradise for any team’s supporters when they’ve got someone who can potentially score from nothing. He’s got this skill and if his team are playing well then he will score the goals.
"He obviously thought highly of us as he could have been at other places but he’s liked Sir Alex’s approach. We’ve done quite well against Arsenal over the last few years, so maybe that’s helped him make his decision to come here."