Police say the incident happened in the Garvaghy Road area.
A PSNI spokesperson said: “Police are appealing for witnesses to a serious assault in the area of the Garvaghy Road, Portadown on Sunday 26th September 2021.
“This took place at approximately 2 o’clock in the morning.
“If you were in the area and witnessed the assault please contact us on 101 and quote serial 1532-01/10/21 or contact Crimestoppers anonymously.”
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