Liverpool star Curtis Jones was seen alerting paramedics to a medical emergency at Anfield during his side's Europa League game against Union SG on Thursday evening.
The midfielder came off the bench in the second half of the clash, with Liverpool substituting several players at half time amid an injury and suspension crisis in attack.
Jones was warming up, therefore, alongside team-mate Dominik Szoboszlai in the first half.
The pair then noticed a medical incident in the crowd, with the incident reportedly occurring in the Main Stand.
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The Athletic reporter James Pearce posted to X (Twitter): "Medical emergency in the Main Stand.
"Curtis Jones, who was warming up, jogged back down the touchline to alert the medics. Fans gesturing that urgent help required."
The game was still 0-0 at the time, and the action was briefly paused by the referee once it became clear to all what was happening.
There has yet to be an official update on the status of the medical emergency.
Jones, perhaps surprisingly, didn't start the Europa League clash at Anfield, which Liverpool won 2-0.
The Englishman will be suspended for the Reds' upcoming Premier League fixture against Brighton after being shown a straight red card against Tottenham last weekend.
But manager Jurgen Klopp decided not to hand the number 17 a start against the Belgian side, who came within minutes of lifting the league title for the first time since 1935 last season.
Ryan Gravenberch scored his first Liverpool goal to put the Reds ahead prior to half time, before Diogo Jota - also suspended for his side's next game - doubled the advantage in the second half after being inadvertently played through on goal by a defender.
Klopp's side sit top of Group E in the Europa League, having picked up all six points available thus far in the competition.
Topics: Liverpool, Curtis Jones, Europa League, Dominik Szoboszlai
Ryan Smart