The Brazil international has been in scintillating form for the Merseyside outfit in the second half of the season after initially making a slow start to his Liverpool career.
The South American scored Liverpool’s second goal in a 2-0 victory over Manchester United in the first leg of their Europa League last-16 clash at Anfield on Thursday.
Firmino scored one goal in his opening 23 games for the Reds following his £29m move last summer, but the 24-year-old has netted eight times and has made three assists in his last 13 outings.
Liverpool captain Henderson heaped praise on the South American, although the England international admitted that he knew nothing about Firmino before his Reds move.
“Being completely honest, I had seen very little of him before he arrived here,” Henderson told the Liverpool magazine.
“Naturally, he needed some time to settle in but he’s been brilliant for us, especially over the last few months.
“He’s a very, very good player with a lot of skill who also works extremely hard for the team. He’s provided goals and I think he’s much more robust than people realise, he’s quite wiry.
“Now it’s about him continuing to grow and get even better.”
Firmino has scored nine goals and has made eight assists in 32 games in the Premier League and the Europa League in his first season in English football.
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