The former Manchester United winger has been outstanding for La Real over the past two games and now also boasts his first goal.
Thanks to his form, Januzaj has won a recall to the Belgium squad this week.
Eusebio says the selection is well deserved: "Januzaj is a very unsettling player, who is bringing us that imbalance in the one against one that allows us to generate more chances of danger.
"But the top players like to score and when they do not have any, it makes them stay a little aware of it and go quiet, and that's why it's good for all the players to score and that's why I'm very happy for him, because he's done a great job.
"We are seeing him more and more adapted to our style, with our ways of playing."