Estevao arrived at Stamford Bridge in the summer from Brazilian club Palmeiras, for whom he scored against the Blues at the Club World Cup. His reputation as one of the world's burgeoning young talents was already firmly cemented.

In a new country, at a new club - and in a significantly different football culture - many understandably felt Estevao would need time to settle at Stamford Bridge. That has not proved the case.

There was an assist on his full debut against West Ham United, a memorable first goal struck in stoppage time to defeat Liverpool, and his first Champions League start, which came against Ajax, was marked with the teenager opening his account in the competition.

There was more to Estevao's display than just his goal, however. The Brazil international, who scored twice for his country against South Korea during the recent international break, was a hub of attacking energy and ambition against the Dutch side.

He constantly looked to beat opposition defenders after receiving possession. His delivery from wide positions, including corners, was consistent. And he often broke into the penalty area to threaten the Ajax goal – one overhead kick late in the game whistled agonisingly past the post.

Estevao's display impressed Maresca, but it didn't come as a surprise to the Chelsea head coach.

He said: 'With young players, most of the time you can be a little bit worried because if they play one or two games well and they score, they think that they are already top players.

'The good thing about Estevao is that we don't need to be worried about that. He's very humble, he's very polite, he wants to work hard. He also has a fantastic family; they are very close to him.

'For me, personally, he's fantastic because he's a special player, but you don't have to be worried.'

Maresca continued: 'I feel very lucky to be his coach because it's exciting, you can enjoy. I've said many times that I think the fans pay for their tickets to see players like Cole [Palmer], like Estevao, this kind of player.

'So it's nice we can have players like Estevao, like Cole, players like them.'

The Blues created a piece of Champions League history against Ajax, as we became the first club to have three different teenagers score in the same fixture.

Marc Guiu was the first; the Spaniard opened the scoring with a neat finish following a header across goal from Wesley Fofana. Estevao later won and converted a penalty before Tyrique George stepped off the bench to score our fifth and final goal of the evening.

'I work with them every day, I know what they can do,' Maresca replied when asked about the youthfulness of those on the scoresheet and within his starting XI, which had an average age of 22 years and 163 days.

'I also know we will have some moments where we struggle a little bit more, for sure. But I think the good thing about them is that they want to learn, they want to improve, so I think it's good.'