Ex-Manchester United midfielders Paul Scholes and Owen Hargreaves believe Casemiro deserves more credit for his quality.
The Brazilian has been a huge influence on the Red Devils since arriving from Real Madrid in the summer.
Casemiro's absence has been felt in games where he has missed out due to suspension, including a loss to Arsenal in the Premier League and a draw with Leeds United.
"Casemiro has been sensational really," Scholes told United media.
"He has great experience, winning so many times with Real Madrid as well, and is invaluable to the younger players around the squad.
"It's almost like he's a coach on the football pitch. You've seen the difference from when he's come into the team and what he's made [happen]. He has great experience and I don't think he gets the credit for the way he plays. He is a really good passer of the ball, which surprised me a little bit, when you think you saw Luka Modric and Toni Kroos as the playmakers at Real Madrid.
"But this lad can play.
"I've heard so many times, as well, that's he's probably the best holding midfielder as well. I don't see him as a holding midfielder. He's a proper Manchester United midfielder that gets involved in everything. You see him up the pitch, you see him defending, you see him controlling the game at times.
"He's probably as close to Roy Keane as you're going to get. I think he's been brilliant.
"I think 'holding midfielder' just does him a little bit of an injustice."
"The biggest difference he made is his first pass is forward," Hargreaves stated.
"He breaks up the play as good as anyone but if you watch him, his passing is always forward and that's what Scholesy did best. Sir Alex always said, in transition, play the ball forward if you can, didn't he Scholesy? I think that's the biggest difference.
"Obviously, Christ Eriksen and Bruno Fernandes's balance is brilliant. It's a shame Eriksen isn't fit but I think he makes a huge difference. I'm with Scholesy, I think his passing is super underrated as he always plays forward."