The English star will not be going along with his teammates to Germany for the tournament.
Maddison was in Gareth Southgate’s initial squad, but has not made the final 26-man list.
"I 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," said Maddison.
"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."
He added: "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."