But Geelong have stressed their star attacker is OK after the "health incident".
Stengle had returned from Tasmania after the Cats' AFL win over North Melbourne in Hobart on Saturday afternoon.
The Seven Network reported the forward attended the Geelong nightclub that night and after falling unconscious, he was rushed to hospital by ambulance around 2am in a serious condition.
Stengle spent several hours in hospital before being discharged.
Ambulance Victoria declined to comment but Geelong confirmed the "health incident" on Monday evening, stressing Stengle was OK.
"The club acknowledges a health incident involving Tyson Stengle over the weekend," Geelong said in a statement on social media.
"Most importantly Tyson is OK and attended the club on Monday.
"The club's priority is Tyson's mental health and wellbeing."
Club statement | The Club acknowledges a health incident involving Tyson Stengle over the weekend.— Geelong Cats (@GeelongCats) Most importantly Tyson is okay and attended the Club on Monday.The Club's priority is Tyson's mental health and wellbeing.July 29, 2024
The Seven Network ran vision of Stengle jogging laps at training on Monday.
It is unclear whether he will be available for Saturday night's clash with Adelaide at GMHBA Stadium.
Stengle kicked three goals in Geelong's 40-point win over North, taking his tally to 37 majors for the season.
The small forward last month signed a five-year deal to remain at Geelong long-term.
He played a crucial role in the Cats' 2022 premiership, turning his career around after he was cut by the Crows in 2021.
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