The 20-year-old has become an integral part of the Braga team this season, scoring three goals and registering six assists in 21 games so far.
Trincão has already helped Braga win the Portuguese League Cup this season, its first major title since 2016.
The silky left-footed forward drew the eye of several of Europe’s biggest clubs when he led Portugal’s under-19s to victory at the 2018 European Championships, finishing the tournament with the most goals and most assists.
“Trincão is quick and technically gifted with a vision that means he is a great creator of goals as well,” Barcelona said in a statement.
The prodigy will remain at Barcelona until his contract expires in 2025 — unless another club is willing to cough up $555 million to pay his release clause.