Voller has also praised German clubs for not taking part in the initial 12 team formation.
The World Cup winner blasted: "A club competition closed in this way is a crime against football."
Then, as an example, Voller brought up the example of Liverpool: "For a club where the fans sing 'You'll never walk alone' it is shameful.
"Borussia Dortmund and Bayern have not joined? It proves they have a backbone."