The 22-year-old, who will be the club’s first Brazilian player in their long history, has signed a two-and-a-half-year deal until the summer of 2027, with an option for an additional year.
The pacey wide man will wear the number 35 shirt in Luke Williams’ side and is thought to add an extra dimension to a Swans side short of creative options in the final third since the season-ending injury to Josh Ginnelly in September.
Having played a majority of his football in his homeland for the likes of Corumbaense, Atletico Goianiense and Gremio Anapolis, Ronald has spent the last 18-months on loan at Portuguese Primeira Liga side Estrela da Amadora.
His deal with the newly promoted side has been cut short with the Swans thought to have beaten off several sides for his signature.
Commenting on the move Ronald said:
“I hope to bring moments of happiness to the game and help my teammates in all aspects of the game.
“I am a winger, I am very fast and good in one-to-one situations. I like to score goals and make assists. I like to attack high up the field, and I hope I can create difficulties for my opponents.
“I am very motivated, it is a dream to be here. I am very motivated and excited to try and provide moments of happiness for the fans of Swansea.
“It has been a dream of mine to play football in the UK. I have achieved that goal and objective and now I want to help the team achieve good things.
“I hope I can adapt as quickly as possible so I can help the team soon.”
[Lead image: Swansea City FC]
