Despite all of his success, the Borussia Mönchengladbach star admits to wondering how the other 10 players live.

"Nobody would want to become a keeper if they knew," Keller cracked German magazine Rund. "But somebody has to do the job."

"Even at the level I’ve achieved, I am totally serious."

"We cannot run with the ball or make challenges, we always have the same stress level," explained the American Abroad. "People say ‘Well, today you had a calm afternoon’."

"That doesn’t happen – I must always be attentive whether I am in the action or not."

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