Oliver Kahn is undeterred that some football experts will argue that his German rival for the goalkeeper position at the World Cup, Jens Lehmann, is more skillful player.

"Some people also believe in the existance of aliens. We are both goalkeepers, not players on the field," Kahn told Wednesday's edition of the Sport Bild weekly.

Bayern Munich's Kahn said he is fully convinced to be the number 1 between the posts at the June 9-July 9 World Cup in Germany like he was in 2002 when he played a major role in Germany reaching the final.

But so is Arsenal's Lehmann, with coach Juergen Klinsmann not to decide the issue until shortly before the tournament.

Kahn said he wouldn't be concerned if Klinsmann fielded Lehmann in the next game March 1 in Italy like he did in the last 2005 game in France.

"That's only a friendly. Of course you want to play. But all that counts is the World Cup-opening game against Costa Rica (on June 9 in Munich," Kahn told Sport Bild.