Januzaj left Manchester United last month for a new challenge in Spain with Real Sociedad.
The 22-year-old failed to make the grade at Old Trafford despite once being tipped to follow in the footsteps of wing wizard legends Ryan Giggs, Cristiano Ronaldo and David Beckham.
And Januzaj has now aimed a dig at Van Gaal, but praised his successor Jose Mourinho for his ‘fairness.’
“My first goal will be dedicated to Louis Van Gaal,” Januzaj told Diario AS.
“I do not want to talk about him, because everyone knows there were difficulties between us. We did not have the best relationship, everyone knows.
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“It was not easy, it’s very frustrating and difficult when you find something like that.
“Mourinho? I have nothing bad to say about him. As a coach I have no criticism, from the beginning it was very fair.
“I want to prove that I’m a good player. There have been a lot of comments on my performance and my quality, whether I have fulfilled those expectations that were on me from before.
“People in football know how to understand the difficulties I have had in my career…not playing many games, being played out of position, sustaining injuries.”
Van Gaal failed to give Januzaj a chance to prove himself, with the youngster making just 28 appearances during the Dutchman’s resign.
Mourinho loaned the Belgium international to Sunderland last term but Januzaj toiled under former boss David Moyes, managing just one goal from 28 games.