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The 25-year-old Aston Villa star ensured his place in the Three Lions team for the competition after Southgate selected him in his final 26-man squad on Tuesday.
And Grealish started for England in their 1-0 win over Austria at the Riverside Stadium.
The England international superbly linked up with Jesse Lingard and Harry Kane in the build-up to Bukayo Saka's opener in the second half.
Grealish was later withdrawn for Brighton defender Ben White, but the Villa man did enough to leave England fans demanding that he starts for the Three Lions in their opening match at the Euros.
One Twitter user said: "Grealish is honestly one of the best players I've ever seen."
While another commented: "There is always something happening when [Grealish] is on the ball."
Someone else posted: "The only thing I have taken from this game is that Jack Grealish has to start every game of the Euros."
And a fourth added: "If Grealish doesn't start every game for England, then Southgate should be sacked immediately."
Southgate will have a difficult decision over his final England XI as Grealish, Manchester City midfielder Phil Foden and Chelsea star Mason Mount all compete for a place.
England will return to action on 6th June against Romania at the Riverside Stadium.
Southgate's men will then kick off their Euro 2020 campaign on 13th June against 2018 World Cup finalists Croatia at Wembley.
Joining England and Croatia in Group D are the Czech Republic and Scotland.
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