The former Manchester United man has praised the Dutchman for sticking to his guns.
The Dutch boss endured a difficult start at Old Trafford as he failed to find a formation and line up that suited his style of play, but turned things around in the second half of the campaign to secure Champions League football.
Despite things being tough at the start, Van Gaal rigidly stuck to his guns and Blomqvist has praised him for having that conviction in himself.
"You have to give him credit as, at one stage, things were looking quite tough and it can be easy to get frustrated and start changing things,” he said.
“He stuck to his methods and was quite sure about them. Now he can stand up there on a podium and say: 'What did I tell you?’"
Van Gaal has come in for criticism this year for some of the tactics he has employed, with the decision to play Wayne Rooney in midfield having been a major bone of contention across the season.
He has also been criticised for employing a long-ball game to utilise the talents of Marouane Fellaini, who has been revitalised during his second year at the club. There have been some big setbacks for his side as well, with a poor run at the end of the season dampening spirits somewhat.
Blomqvist, though, says Van Gaal has the charisma to handle it all.
"He has that charisma and also that experience to handle the big setbacks," he added.
"He knows what to do and he has trust in his own philosophy. He knows that it works if he does the right moves because he's done it so many times in the past.”