Ferguson is sensitive to criticism about his leading scorer just because he has not netted for his club since February 10.
"Listen, Van Persie was fantastic on Monday. Along with Phil Jones he was our best player," said Ferguson.
"I haven't paid attention to the selections for Footballer of the Year since 1999 when we won the Treble and David Ginola of Spurs was given Player of the Year.
"For this year, I don't watch all of the players all the time but, if I had a vote, Van Persie would surely be up there."