The 24-year-old has penned a deal which extends his stay until the summer of 2031, with a club option of a further year.
Following a first season in west London that was interrupted by injury, Thiago has netted 17 goals in 26 Premier League games this term, also scoring in the Bees’ Carabao Cup win over Bournemouth in August.
“It’s brilliant that Thiago has committed his long-term future to the club,” said head coach Keith Andrews.
“The connection that he has with his team-mates, the staff and the fans, as well as how much the club means to him and he means to us, is pretty evident for everybody to see.
“Again, it’s the person before the player. I love working with him and I’ve loved seeing his evolution as a player. How he plays is such a big part of how we play and what our season has been so far.
“He’s been a massive player for us, so it’s a contract he thoroughly deserves and I’m really happy that the club have been able to get it done.”
Having excelled in Europe with Ludogorets and Club Brugge after departing his native Brazil, Brentford signed Thiago for a then club-record fee from the latter in February 2024. He spent the remainder of the campaign with Brugge before joining Brentford officially in July.
The imposing Brazilian netted two goals in a pre-season friendly against AFC Wimbledon, but sustained a meniscus injury which saw him miss the opening two months of his first campaign in TW8.
He made his debut as a second-half substitute against Everton in November 2024, making three more appearances before a joint infection saw him absent until the final four games of the season.
Everton away was a notable fixture for Thiago again this term as he scored his first Premier League hat-trick in the Bees’ 4-2 win at Hill Dickinson Stadium.
Thiago’s prolific form has seen him become the fastest player to reach 10 Premier League goals in a single season for the club – surpassing Ivan Toney’s record during the 2022/23 campaign – and bag braces in home victories over Manchester United, Newcastle United, Burnley and Sunderland.
In November, the 6ft 2in frontman also became the first Brentford player to win the Premier League Player of the Month award.
Only Manchester City striker Erling Haaland is ahead of him in the race for the Golden Boot, having scored five more goals during the opening 26 games.
