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The Aston Villa talisman scored six goals and laid on 12 assists last season, which won him inclusion in the Three Lions squad for the European Championships - but has barely played any minutes during this summer's showpiece.
Grealish was the star of both of England's Euro 2020 warm-up friendlies, but was, surprisingly, unused in their first match against Croatia and only came on as a substitute during the stalemate with Scotland.
The England hierarchy confirmed on Tuesday that the pair must isolate up to and including Monday, 28 June, after coming into close contact with Chelsea team-mate Billy Gilmour for more than 15 minutes after the Scotland midfielder tested positive for coronavirus.
We can confirm that @BenChilwell and @masonmount_10 must isolate up to and including Monday 28 June. This decision has been taken in consultation with Public Health England.
- England (@England) June 22, 2021
While Mount stays in isolation, it will give Grealish the opportunity - and platform - to show Gareth Southgate his worth - with fans already recognising the 25-year-old as one of England's most entertaining players.
The Athletic has delved into the relationship between Grealish and Southgate, with sources close to the camp indicating that the Three Lions manager doesn't trust the Villa ace.
It goes on to state that Southgate has dressing room favourites and that Grealish's "partying image" counts against him.
However, it is not all negative, as Southgate is believed to value Grealish as a likeable and popular member of his group - as well as being one of the most talented amongst the squad.
Concerns over Grealish's work rate off the ball is also said to be behind Southgate's decision not to start the player in crucial matches.
Fans have since taken to social media in their thousands to have their say on Grealish, who they believe should be given a more prominent role in the England set-up.
And Southgate, who could also hand Bukayo Saka his first appearance of the tournament tonight, is ready to unleash Grealish as the Three Lions look to secure top spot in the group.
The match will be Maguire's first start since he sustained an ankle injury in Manchester United's Premier League win at Aston Villa on May 9.
Elsewhere, Kyle Walker is set to return at right-back after being rested for the draw against Scotland on Friday.
The fact England have now qualified for the knockout stages will also have had an influence on Southgate's changed team selection.