So the deadline form cutting the squads down to 23 was midnight last night, here are some of the final squads.
Belgium
Courtios, Mignolet, Gillet.
Alderweireld, Ciman, Denayer, Kabasele, Jordan Lukaku, Meunier, Vermaelen, Vertonghen.
Dembele, Fellaini, Nainggolan, Witsel.
Batsuayi, Benteke, Carrasco, De Bruyne, Hazard, Romelu Lukaku, Mertens, Origi.
Croatia
Subasic, Kalinic, Vargic.
Corluka, Srna, Vida, Vrsaljko, Schildenfeld, Strinic, Jedvaj.
Modric, Rakitic, Kovacic, Brozevic, Perisic, Badelj, Rog, Coric.
Mandzukic, Kalinic, Pjaca, Cop, Kramaric.
France
Costil, Lloris, Mandanda.
Digne, Evra, Jallet, Koscielny, Mangala, Umtiti, Sagna, Rami.
Cabaye, Schneiderlin, Kante, Matuidi Pogba, Sissoko.
Coman, Gignac, Giroud, Greizemann, Martial, Payet.
Germany
Neuer, Leno, Ter-Stegen.
Boateng, Can, Hector, Howedes, Hummels, Mustafi, Ruediger.
Draxler, Khedira, Kimmich, Kroos, Muller, Ozil, Podolski, Schurrle, Schweinstiger, Weigl.
Gomez, Gotze, Sane.
Italy
Buffon, Marchetti, Sirigu.
Barzagli, Darmian, Bonucci, Chiellini, Ogbonna, De Sciglio.
Bernardesci, Candreva, De Rossi, El Shaarawy, Florenzi, Giaccherini, Motta, Parolo, Sturaro.
Eder, Immobile, Insigne, Pelle, Zaza.
Northern Ireland
Mannus, McGovern, Carrol.
Cathcart, Evans, McAuley, McCullough, McLaughlin, Hodson, Hughes, McNair, Baird.
Davies, Norwood, Evans, Ferguson, Dallas, McGinn, Ward.
Lafferty, Washington, Magennis, Grigg.
Portugal
Rui Patricio, Lopes, Eduardo.
Vieirinha, Cedric, Pepe, Carvalho, Alves, Fonte, Eliseu, Guerrero.
William Carvalho, Pereira, Moutinho, Sanches, Silva, Gomes, Mario.
Rafe Silva, Quaresma, Nani, Ronaldo, Eder.
Republic Of Ireland
Randolph, Given, Westwood.
Christie, Coleman, Clark, Keogh, Duffy, O'Shea, Ward.
McClean, Whelan, McCarthy, Hendrick, Quinn, Hoolahan, Meyer, Brady McGeady.
Walter, Long, Keane, Murphy.
Spain
Casillas, De Gea, Rico.
Bartra, Alba, Pique, Azpilicueta, Bellerin, Ramos, Juanfran.
Busquets, San Jose, Fabregas, Thiago, Soriano, Iniesta, Koke.
Pedro, Silva, Morata, Adruiz, Vazquez, Nolito.
Got the squads from the BBC Sport website, they have all the squads up there.