An initial 33-man training squad needed reducing to 26 players by 11pm on Friday, just over an hour after their last warm-up friendly against Iceland finished.
However, rather than wait until UEFA’s deadline, Southgate chose to announce his final selection on the eve of the Wembley send-off.
The inexperienced quartet of Jarrad Branthwaite, Curtis Jones, James Trafford, and Jarell Quansah unsurprisingly missed out, although the omissions of Grealish, Maddison, and Maguire were more notable.
Manchester City playmaker Grealish and Tottenham’s Maddison made substitute appearances against Bosnia and Herzegovina on Monday but have both been informed they will not be going to Germany.
Maddison wrote on social media: “Devastated doesn’t quite cut it. Trained well and worked hard all week but if I’m honest with myself, my form for Spurs when coming back from injury in the second half of the season probably wasn’t at the levels I had set which gave Gareth a decision to make.
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“I still thought there would be a space for me in a 26-man squad as I feel I bring something different and had been a mainstay in this whole qualifying campaign for Euro 2024 in Germany but the manager has made the decision and I have to respect that.
“I’ll be back, I have no doubt. Wishing the boys all the luck in the world out in Germany, unbelievable group and lads that I literally call some of my best friends. I genuinely hope football comes home.”
Grealish has yet to publicly react to missing the squad but Southgate says he is similarly heartbroken.
Asked about the City forward’s dip in form this season, the England boss said: “I don’t think today would be a good day to talk about the bigger picture. I don’t think that would be fair.
“I have just delivered a really difficult conversation to a lad who is devastated. I think the world of him as a kid. Yes. I am not going to go any broader than that.”
Maddison and Grealish follow Southgate’s bold decisions to leave the likes of Marcus Rashford and Jordan Henderson from England’s training squad.
Maguire has been key, much like the latter pair, in England’s impressive tournament runs under Southgate.
The 31-year-old defender picked up a calf injury in training in early May and Manchester United thought he could be back for the FA Cup final, but a slow recovery time ruled him out of that and now the Euros.
“I am devastated not to have been selected to play for England at the Euros this summer,” Maguire posted on social media.