And Nagelsmann believes he is one of the very best across the globe.
Nagelsmann told Bild: "Of course, I follow his development. Unfortunately, we also played against him.
“He is one of the top five strikers in the world. He is certainly one of the top three in the Premier League.
"He is not a brutal striker, but he has an interesting overall package - an average of 15 goals and 15 assists. This is very unusual for a striker.
"Firmino always has a look for the next man.
Roberto Firmino nutmegs Maribor defender to win a penalty
Invalid email
We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. Read our Privacy Policy
"What sets him apart from many other strikers is his work off the ball. What he does in the high tempo league of England every three days is extraordinary."
Firmino moved from Hoffenheim to Anfield in 2015.
The striker set his personal best when at the Bundesliga outfit, netting 16 goals in the 2013-14 campaign.
But with nine games to go, beginning with a trip to Manchester United on Saturday, Firmino can certainly eclipse that total.