With the Spurs leading 2–1, fans in the crowd at the East Stand at St James’s Park alerted players to the incident.
Tottenham’s Sergio Reguilon can be seen talking to referee Andre Mariner, pointing to the stands.
His teammate Eric Dier ran across the pitch as a physiotherapist tried to pick up a defibrillator on the other side of the pitch.
After a while, Mariner removed both sets of players from the pitch while the man continued to receive medical attention.
Newcastle provided an update on the health of the fan after a short break with players ready to resume.
After a brief warm-up on the pitch, the first half resumed with seven minutes of extra time, Newcastle wrote on Twitter.
Tottenham eventually won the game 3–2 with Tangi Ndombele, Harry Kane and Son Heung-min scoring.
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