The two players are vying for a spot in England's midfield, with manager Gareth Southgate opting to play Mount in the win over Belgium, but the Chelsea star believes there is room for both of them in the starting line-up.
Mount told Sky Sports: "I love watching him [Grealish] play. He's brilliant to be around. Obviously we all know what he can do, what a brilliant player he is.
"I get on very well with Jack. He's a brilliant player and, yes, we always want to play together.
"We have such a strong group with loads of top, top players. You always want to play with the best and when you come away with England you're doing that.
"It means so much to come away and play with the likes of Jack and the top, top players in the group."
Mount admits that he has been learning a lot about his team-mates whilst on international duty.
He explained: "You're learning all the time. Sometimes when you come away you don't really know what kind of moves they make on the ball.
"You have to kind of learn about the players while you're away training. You don't get much time, but when you're playing the games you kind of have that connection and I think me and Jack do definitely have that.
"You always want to play with the best players, win a lot of games as a group."