His Brazil teammate joined Barcelona last month in a deal worth a staggering £142m.
And the 26-year-old believes the players have taken it upon themselves to cover the loss of their once damaging playmaker.
"Yes, of course," said Firmino when asked if he enjoyed being a leader with Coutinho gone.
"Coutinho is a great player but we have substituted him with no problem.
"Everybody has great responsibility but that's our job, to deal with that responsibility."