Grealish pinpointed Chelsea ace Mount as one of the most hardworking players in the camp.
"Mount is one player that trains at 100 per cent," Grealish said, "He is top class out there.
"It's a bit annoying because he probably gets a bit of stick at times from it."
The Chelsea Player of the Year has been instrumental for the Blues and put in a fantastic display for the Three Lions in their first Euro 2020 game against Croatia.
"I love Mason," Grealish continued. "I have always been close with him and I think he is an absolutely terrific player."
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