However, the Aston Villa man said the issue was one he simply has to keep an eye on, as he and the England physio team work together to ensure he's fit to play during the summer.
Speaking to ITV Sport after England's win, Grealish said it was great to be back in action for the Three Lions.
"Yeah it's been a great few days," he said.
"Being announced in the final squad is what I worked for all season, I've not shied away from saying that.
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
"I'm not concerned, I'm aware of it a bit so I have to keep on top of it and do whatever I can to heal it after I play in these games, that's why I had the ice on."
Grealish also spoke about the injury sustained late on by Trent Alexander-Arnold, who looked in significant discomfort as he was led around the pitch after sustaining what appeared to be a thigh strain in the closing minutes of the match.
"I'm not too sure what's happened," admitted Grealish.
"It didn't look good the way he walked around the pitch, but let's hope he'll be okay in the next few days."
Now Grealish and England will turn their attention to their final pre-tournament friendly with Romania before they get set for the start of the Euros.
And the Villa man said a good, competitive run-out against an at-times hard-nosed Austrian side was just what the team needed to help get them match-sharp ahead of the tournament.
"It was hard, but you can't knock Austria," he said.
We saw @JackGrealish icing his leg after being substituted against Austria - but why?