Manchester United and Spain goalkeeper David de Gea has branded the new World Cup ball "really strange".
The Adidas Telstar 18 will be in use at the 2018 World Cup in Russia.
De Gea conceded from distance in Spain's 1-1 draw with Germany on Friday night when Thomas Muller's strike appeared to move away from the goalkeeper's hands in the final moments.
"It's really strange. [The ball] could have been made a lot better," De Gea told reporters.
Spain, who triumphed at the 2010 World Cup before exiting in the group stages of the 2014 competition, will continue their preparations for this summer's tournament with a friendly against Argentina on Tuesday night.
