The forward joined the London club from Club Brugge for a £30 million fee in the summer of 2024.
Over halfway through the campaign, Brentford are in fantasy land.
Following victories in their last five outings, and a Brazilian striker netting the goals, suddenly Bees fans are envisioning thoughts of trips to European capitals next season.
A emphatic three-nil win over the Black Cats moved their manager's side into fifth in the top flight – a position that was sufficient to secure European football last season.
Only leaders Arsenal have accumulated more points over the past six games.
There's a significant distance to go yet but Brentford are squarely in the battle for European football.
No one was forecasting this last off-season.
The former head coach had departed for Tottenham after a seven-year stint in charge, a period in which he had not only guided the club to the Premier League but also cemented them in the top flight.
Club captain their Danish midfielder left for the North London club and goal-scoring duo Bryan Mbeumo and Yoane Wissa – who scored a total of 39 goals in 2024-25 – were out the door, joining United and Newcastle United respectively.
Specialist coach Keith Andrews was elevated to succeed Frank, while there was no striker among the summer signings.
A season of struggle, possibly even the drop, was widely predicted. Yet here we are in the new year with the club in the upper echelons.
So, how did they pull it off?
Brentford's decision not to sign another striker was partly down to circumstance, with one forward's move not going through until deadline day.
But they also were aware they had a £30 million striker already waiting to go.
The 24-year-old joined from Club Brugge in the summer for a then club record fee, but was plagued by fitness issues in his first campaign, going goalless in his initial outings.
Thiago has gone about making up for lost time this season, though, with his double against Sunderland taking him to sixteen league goals – the most by a Brazilian in a single Premier League campaign.
Considering the countrymen who have preceded him, that is a remarkable feat, especially with 17 games remaining.
"He's been a breath of fresh air," pundit Danny Murphy said. "He's physically intimidating, quick, strong, but more skilled than people think. Excellent with his feet, both feet, he can score off both. You can see he's brimming with confidence. His statistics are fantastic. He must be so proud. That's a huge compliment to him."
That only a trio of global superstars have scored more in any of Europe's top five leagues to this point highlights the level he is playing at.
And it is not just the volume but the crucial nature of the goals that have been so vital for his team.
His first goal against the opposition was his seventh first goal of a game of the season. Considering how often we are told the significance of the initial strike in a game, having someone you can depend on to take that early opportunity cannot be overstated.
Prior to the game against their opponents, no player to have attempted at least thirty efforts this season has a better shot accuracy rate than the striker's 59.1 percent.
He finds the target. Achieve that consistently and the goals will – and have – come.
Given the struggles he had in his youth, where he worked as a bricklayer to support his family following the death of his father, perhaps it should be no surprise that pressure on the pitch is something he handles with ease.
"The recruitment team deserve a lot of praise for the kind of players they bring in and personalities," Andrews said. "It is really notable. He is a really unique person who has fitted into life very nicely. He has had to forge this path. He has worked for his journey and toiled. He has got real determination about his personality. He is developing his skill set constantly and we are discovering more and more about him. He is a largely all-round centre-forward."
Their star striker is the man of the moment but the team are not and have never been a single-player team.
While they had key individuals – Ivan Toney, Christian Eriksen, Mbeumo and Wissa – under their previous boss, they were always seen as a team more effective than the individual components.
The fear was that once the Dane left, that may not be the case, and that the sum of Brentford's parts alone might not be enough to avoid relegation.
As a result, appointing Andrews, with a blank managerial CV, and just a twelve months at the club was seen by those external observers as a huge risk.
A maiden role is a test for anyone, let alone when it comes in the world's toughest league and having made the jump from set-piece coach to the top job.
But given that Ipswich Town manager one candidate was the only other option that the hierarchy looked at, they were clearly confident they had the right man.
To date, as often seems to be the case with the key decision makers at the club, it looks as if they were correct.
The new boss won just one of his first 5 league games in charge but significant home victories against Manchester United, the Reds and Newcastle have followed.
Results that, following their excellent recent form, could prove all the more important in the race for Europe.
"We are in good form and playing really good. We are playing with bravery and belief in everything we do with and without the ball," Andrews added. "We are pleased with how we are going but we want to keep pushing."
In a league where fourth and 15th are currently separated by just a handful of points, they have no other option, because things could quickly look very otherwise.
But, for now, Brentford are beating the predictions. And the longer that continues, the closer to reality those aspirations of the continent will become.
Lena is a passionate gamer and tech writer, specializing in indie games and esports coverage.