Playing for City of Leeds in the local league, Nemeth adopted the correct defensive position to block an opponent's drive, but on taking the charge, crashed to the floor and fractured an elbow.
Watford Royals, bottom of the Budweiser League after losing all 12 games, hope to have new American Philip Powe for Saturday's visit to Derby.
They have also applied for a work permit for the American Cleave Lewis, who has been playing for National League Division One club Guildford.
SAINSBURY'S CLASSIC COLA NATIONAL CUP Quarter-final draw: Thames Valley v Greater London; Birmingham v Worthing; Sheffield v Leicester; London Towers v Manchester.
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