Simon Mignolet, Divock Origi and Christian Benteke will be on their way to France.
Origi will be delighted to be named in the provisional 24-man squad, and will hope he can regain fitness in time for the tournament.
Belgium's opening game will be against Italy on June 13.
Squad in full:
Goalkeepers: Thibaut Courtois (Chelsea), Simon Mignolet (Liverpool), Jean-Francois Gillet (Mechelen)
Defenders: Toby Alderweireld, Jan Vertonghen (Tottenham), Nicolas Lombaerts (Zenit st Petersburg), Jason Denayer (Manchester City, on loan at Galatasaray), Dedryck Boyata (Celtic), Bjorn Engels (Club Brugge), Jordan Lukaku (Oostende), Thomas Meunier (Club Brugge), Thomas Vermaelen (Barcelona)
Midfielders: Axel Witsel (Zenit St Petersburg), Marouane Fellaini (Man Utd), Mousa Dembele (Tottenham), Radja Nainggolan (Roma)
Attackers: Eden Hazard (Chelsea), Kevin De Bruyne (Manchester City), Romelu Lukaku (Everton), Dries Mertens (Napoli), Michy Batshuayi (Marseille), Christian Benteke (Liverpool), Divock Origi (Liverpool), Yannick Ferreira-Carrasco (Atletico Madrid)
Standby: Nacer Chadli (Tottenham), Laurent Ciman (Montreal Impact), Laurens De Bock (Club Brugge), Guillaume Gillet (Nantes), Thorgan Hazard (Borussia Monchengladbach), Kevin Mirallas (Everton), Matz Sels (Gent)