The winger has turned down a new contract offer at Swedish side Halmstads to make the move to the Championship side for an undisclosed fee and he's expected to be involved in the youth set-up initially at the club.
Speaking to the official Brentford website, the teenager said: "I don't really talk about it (Garrincha) that much because I don't want it to affect my football or my life, but it is always in the back of my mind so I do think about it.
"I like to think there's a little bit of him in how I play. I am an offensive player who is technical and likes to score goals."
Brentford's head of football operations, Robert Rowan, said: "He's had a good couple of years in Sweden at club and international level, which initially brought him to our attention.
"We invited him to train with us in December for a few days, and he really impressed the technical staff. Henrik is a wide attacker who is intelligent in possession, quick, direct and a good finisher."