Jack Grealish was reportedly caught ‘off-guard’ by his omission from Gareth Southgate’s England squad for Euro 2024 on Thursday. The Manchester City star has been a regular on the international scene over the past few years, making 36 appearances for the Three Lions since making his debut back in 2020. But Grealish won’t be travelling to Germany this summer as England look to win the European Championships for the first time. The 28-year-old was one of the biggest omissions on Thursday, with James Maddison, Harry Maguire, Jarell Quansah, Jarrad Branthwaite, James Trafford and Curtis Jones fail…