Ferguson praised the Welshman after he completed his 900th appearance for United, marking it with the winning goal in injury time.
"For a player to play for one club for 900 games is exceptional, and it won't be done again," Ferguson told the BBC.
"He deserved that goal for his service to the club. He's had an amazing career and he's an amazing man."
Man of the moment Ryan Giggs added: "To play 900 games for this club, who I've grown up supporting, is special -- it's a great day for me.
"I am sure there will be more twists and turns in the title race and I expect more drama and late goals."