The 20-year-old moved to Anfield over the course of the summer, months after the club initially tried to sign him from Fulham.
A deal had been agreed in January but the move broke down in the final hours of the transfer window, with Carvalho playing a key role in helping Marco Silva’s side win the Championship.
While an injury has threatened to derail his progress in the first-team in the short-term, Jurgen Klopp has called on Carvalho often.
The midfielder has made six appearances so far this season, scoring a dramatic winner against Newcastle United, making quite the impact on Merseyside.
Having emerged as one of the hottest talents in English football during his time with Fulham, Firmino has revealed he kept tabs on his teammate earlier in his career.
“I confess that I had watched some of his games before he came to Liverpool, so I was already impressed by the way he played,” he told Liverpool’s official website.
“He’s a star, he’s a great player and now he’s also a very close friend. We are happy to have him here at Liverpool and I know he will help us a lot, with assists, goals and also his character on the pitch.”