Giggs has been appointed to David Moyes' backroom team along with another member of the famed 'Class of 92' which Harrison was responsible for bringing through the ranks, Phil Neville.
Although Giggs will be eased in gradually, having entered his 24th top-flight campaign as a United player, it is clear that is the direction he is heading, with some already speculating he will end up as Red Devils boss at some stage in the future.
Speaking at the annual McDonald's Community Awards, Harrison said: "Without doubt Ryan will be a success.
"He is a football nut. I am glad he is doing what he is doing.
"It would have been a tragedy if he had said 'right, I am going to play golf every day'. He gets bored after five minutes if it is not football."
Nevertheless, as coaches Giggs and Neville have to prove themselves in a manner they did such a long time ago as players.
And the major difference is, they are not entirely in charge of their own destiny given results are determined by the performances of others.
Given those results during pre-season have not entirely gone to plan, Harrison has resolved to have a chat with the pair, plus reserve team coach Nicky Butt, later this week, to ensure they have the confidence required heading into a new campaign so full of uncertainty following the exit of Sir Alex Ferguson.
"It's not often but occasionally I will sit down and have a word with them," said Harrison.