After appearing on the outer at Chelsea before being recalled from his Crystal Palace loan last season in January, Chalobah is now a first-choice for Maresca this new season.
"Since he came back in January, he’s doing very well," Maresca replied when asked about Chalobah’s form.
"The reason why we achieved what we achieved last season is also because of Trev. In the final against PSG in the Club World Cup, he was top and he is doing very well and we are happy with him."
Chalobah, himself, also told the club's website: "Obviously, being one of the experienced players now – I’m not a young boy anymore – I’m just helping the younger players and the new players that have come in.
"I’m just stamping my authority and showing a bit more personality and captaincy. It’s not just about me wearing the armband to go out there and lead the boys."