UEFA president Aleksander Ceferin is threatening to ban players from the 12 Super League clubs from competing in such international competitions as the upcoming Euro 2020.
Is it going to make top European national sides weaker and who will be the frontrunner if Ceferin sticks to his promise?
Below are probable line-ups for six teams that are most likely to lift the cup.
England
GK: Nick Pope (Burnley) DEF: Matt Targett (Aston Villa), Tyrone Mings (Aston Villa), Conor Coady (Wolverhampton Wanderers), Matty Cash (Aston Villa)
MID: Calvin Philips (Leeds United), James Maddison (Leicester), Declan Rice (West Ham United)
FWD: Jack Grealish (Aston Villa), Dominic Calvert-Lewin (Everton), Jadon Sancho (Borussia Dortmund)
Germany
GK: Manuel Neuer (Bayern Munich)
DEF: Lucas Klostermann (RB Leipzig), Niklas Sule (Bayern Munich), Emre Can (Borussia Dortmund), Robin Gosens (Atalanta)
MID: Leon Goretzka (Bayern Munich), Florian Neuhaus (Borussia Monchengladbach), Josua Kimmich (Bayern Munich)
FW: Serge Gnabry (Bayern Munich), Julian Draxler (PSG), Leroy Sane (Bayern Munich)
Spain
GK: Unai Simon (Athletic Bilbao)
DEF: Jose Gaya (Valencia), Inigo Martinez (Athletic Bilbao), Pau Torres (Villareal), Jesus Navas (Sevilla)
MID: Mikel Merino (Real Sociedad), Dani Olmo (RB Leipzig), Fabian Ruiz (Napoli)
FW: Mikel Oyarzabal (Real Sociedad), Gerard Moreno (Villareal), Adama Traore (Wolverhampton Wanderers)
Italy
GK: Alessio Cragno (Cagliari)
DEF: Leonardo Spinazzola (AS Roma), Gianluca Mancini (AS Roma), Francesco Acerbi (Lazio), Alessandro Florenzi (PSG)
MID: Manuel Locatelli (Sassuolo), Marco Verratti (PSG), Gaetano Castrovilli (Fiorentina)
FW: Lorenzo Insigne (Napoli), Ciro Immobile (Lazio), Domenico Berardi (Sassuolo)
France
GK: Steve Mandanda (Marseille)
DEF: Lucas Digne (Everton), Luca Hernandez (Bayern Munich), Presnel Kimpembe (PSG), Benjamin Pavard (Bayern Munich)
FW: Wissam Ben Yedder (Monaco), Kylian Mbappe (PSG), Kingsley Koman (Bayern Munich)
Portugal
GK: Rui Patricio (Wolverhampton Wanderers)
DEF: Rafael Guerreiro (Borussia Dortmund), Pepe (Porto), Jose Fonte (Lille OSC), Nelson Semedo (Wolverhampton Wanderers)
MID: Joao Moutinho (Wolverhampton Wanderers), Danilo Pereira (PSG), Ruben Neves (Wolverhampton Wanderers)
FW: Gonzalo Gedes (Valencia), Andre Silva (Eintracht Frankfurt), Rafa Silva (Benfica)
