The Spain international is preparing to face the Belgian this Saturday as Jose Mourinhos side take on Antonio Contes men in the FA Cup final at Wembley.
Mohamed Salah has been crowned PFA Player of the Year after an impressive season at Liverpool, while the Egyptian also won the Premier Leagues Golden Boot with his record-breaking 32-goal campaign.
But Herrera believes Hazard should still be considered the divisions best player.
For me, Hazard is the best player in the league, the United midfielder said on The Big Interview with Graham Hunter.
In my opinion hes the best player in the league, Ive said that since my first day here.
Herrera also believes his United teammate David De Gea is comfortably the best goalkeeper in world football.
For me, David is the best by far, said Herrera.
I think he has something that comes from god.
God chose him in the goal and god chose Messi on the pitch.
You cannot train what he did against Liverpool [at Anfield].
You cannot train what he did against Kun Aguero when he was two metres in front of him and he put the hand out, you cannot train it.
You can train when he receives the ball from the left defender and he passes the ball to Antonio Valencia pefect.
You can see when he receives the ball he knows always what to do.
He has some special abilities that I think he hasnt trained them, because you cannot train them, you just have them.
More: Manchester United FC