Rotherham vs Birmingham was temporarily suspended after a medical emergency in the crowd halted play.
The Championship match was stopped by the referee in the ninth minute after a fan became ill.
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After two minutes, both sets of players left the field as the emergency continued to be dealt with.
Medics rushed to attend to the supporter, who has since been escorted out of the New York Stadium.
And after a short warm-up, the match was resumed with 11 minutes on the clock.
Rotherham posted on social media: "Everyone at Rotherham United would like to place on-record our sincere thanks to the paramedics, medical professionals and both sets of supporters for the professionalism and compassion which was displayed throughout the medical emergency at AESSEAL New York Stadium this afternoon.
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"Our thoughts and prayers are with the supporter, who was taken to hospital from the stadium after being treated on-site by medical support from St. John's Ambulance and the respective doctors of both clubs.
"In unimaginably difficult circumstances it was incredible to see allegiances on the pitch put aside and the efforts of the medical professionals and support staff receive the commendation that they deserved from everyone inside AESSEAL New York Stadium.
"We now ask that the supporter's privacy is respected during this time."
Birmingham also posted on X: "We'll have a small break in play here owing to a supporter medical emergency. Sending our best wishes to those involved."
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Rotherham have already been relegated from the Championship while Birmingham are fighting to stay in the second tier.
It is also Steve Evans' first game in charge after making the shock move to the Yorkshire club, leaving promotion-chasing Stevenage behind last week.
Watch the incredible drone footage that caught the Portsmouth fans' pitch invasion as they secured promotion
Evans had previously managed the Millers between April 2012 and September 2015 after Leam Richardson was sacked and will be tasked with getting them back in the Championship.
Birmingham are only out of the relegation zone on goal difference going into the weekend after a disastrous campaign that saw Wayne Rooney sacked having coached just 15 games.