The Premier League match between Watford and Chelsea was paused after a medical emergency in the stands.
Referee David Coote ordered both sets of players off the pitch and in to their dressing rooms with the score 0-0 at Vicarage Road.
Medical staff from both teams had rushed into the crowd to deal with the emergency.
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The incident happened while Watford defender Adam Masina received treatment.
"The players have returned to the field in preparation of play resuming," said Watford in a statement posted on Twitter.
Our thoughts are with the fan – who had a cardiac arrest but has now been stabilised – and all those affected. Thank you to the medical staff, players and fans for their quick response.
In October, the Premier League match between Newcastle and Tottenham was halted as a fan received medical attention in the stands.
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