The Swans have bolstered their attacking options for the second half of the Championship season by signing Nunes on loan from the Bees until the end of the campaign.
Head coach Matos confirmed the deal ahead of Saturday’s trip to Hull City, where Nunes could make his debut.
“He is really good on one-v-one, with creativity and a lot of Brazilian swag, if you want to say it like that,” said Matos.
Nunes joined Premier League side Brentford in the summer of 2024 for a reported £10m fee from Brazilian club, Gremio, underlining the high regard in which he is held.
He has since made three Premier League substitute appearances for the Bees, plus two more off the bench in cup competitions, but he has yet to start a game for the west London club.
But the Swans hope regular Championship football will help unlock his potential.
Nunes will compete for staring spots alongside fellow Brazillian Ronald, as well as Eom Ji-Sung and Zeidane Inoussa, who is currently sidelined with a back injury.
The Portuguese head coach described the 20-year-old as a player capable of adding creativity, flair and versatility to his squad as Swansea look to improve their away form and maintain their push up the table.
“We wanted someone who can play both sides and as well who can add creativity,” said Matos.
“Gustavo has that inside of him. He's someone that we are really happy to have here. He was with Brentford for a period of time, which helps him to adapt to the UK.
“We were thinking on someone with these qualities, with this profile. That's something that came up. Now, we are happy to have him in and we need to work together to get the best out of him.”
Nunes is expected to operate primarily on either flank, where Matos believes his one-v-one ability and technical skill can make a difference.
The Swansea head coach acknowledged the challenge of the Championship but backed the youngster to adapt quickly.
“It’s the Championship, it's something that is different for him. He knows that as well.
“He understands now what is the difference between the two competitions. It’s about us trying to get the best out of him.”
Despite his age, Nunes arrives with a growing reputation and long-term ambitions of becoming a Premier League regular. Matos has no doubts about his ceiling.
“Yes, that potential one, no doubt about it,” he said when asked if Nunes could eventually play at the top level.
The loan move also reflects Swansea’s wider recruitment strategy under Matos, who has repeatedly stressed the importance of finding the “right opportunities” rather than simply adding numbers during the transfer window.
“Yeah, it's always about that. We always try to find the best opportunities. We found that opportunity here with Gustavo,” he said.
“He's a big talent, big potential. We want to help him reach the level he wants as a club and me as a manager.
“And then, of course, in the end of the season, he will return. We hope that it’s a perfect marriage for everyone.
Nunes becomes the second player to join Swansea during this window, following former Crystal Palace veteran defender, Joel Ward.
The team has shown encouraging signs at home, remaining unbeaten in six league matches at the Swansea.com Stadium, but have struggled to translate performances into points on the road.
