Last season, Estevao became the first player under the age of 18 to achieve 20 goal involvements in a single season in Brazil's Serie A, breaking a record set by Neymar, by scoring 12 times and adding eight assists.
The new season in South America restarted in February and Estevao has registered 11 goals and five assists in 36 matches in all competitions.
In the Club World Cup, he has won Superior Player of the Match twice and, perhaps fittingly, impressed against Lionel Messi's Inter Miami, having earned the nickname Messinho - 'Little Messi' - in Brazil.
Senior officials have privately expressed excitement about Estevao's performances. Meanwhile, a prominent source working with Brazilian players told BBC Sport that Estevao is widely regarded as a bigger talent than even Real Madrid's teenage forward Endrick or Manchester City defender Vitor Reis.
However, there is also an acceptance that he will need to be eased in initially while adapting to English football.
Estevao will join a star-studded attack at Stamford Bridge, featuring Cole Palmer, Noni Madueke, Pedro Neto, Nicolas Jackson and Christopher Nkunku, as well as new signings Joao Pedro, Liam Delap and Jamie Gittens.
In fact, Joao Pedro has become the 18th forward to sign for Chelsea in just over three years under their current owners.
Chelsea supporters will be excited to see their new £55m signing after his move from Brighton - the 23-year-old he striker was registered before the 3 July deadline and has been training with his new squad at Barry University in Miami.
It means Joao Pedro is expected to at least be on the bench for the quarter-final. "We are happy with Joao and will see if we we're going to give him some minutes," said Maresca.
Once Gittens joins the club after the tournament after agreeing a move from Borussia Dortmund, the Blues will have 17 forward players on their books
His arrival to play as either a right winger or number 10 is expected to put Madueke's position most under threat in the longer term, but no player is being forced out initially to facilitate his arrival.
Meanwhile, midfielder Romeo Lavia is a doubt for the match because of "muscular problems" and Moises Caicedo is suspended.