The man was stabbed in the back in East Park in Southampton just before 8pm on Monday 4 March.
The assault took place near the Titanic Engineers’ Memorial in East Park.
The man was transported to hospital where he remains with serious but not life threatening injuries.
Three people were arrested in connection with the assault shortly after the incident occurred.
A 23-year-old woman, a 23-year-old man and a 24-year-old man were questioned by officers and then released on bail with conditions to stay outside of Hampshire.
A further two men were arrested, a 27-year-old man of no fixed abode and a 24-year-old man from Southampton on suspicion of conspiring to commit grievous bodily harm.
They have since been released from police custody but remain under investigation.
The investigation is ongoing.
Chief Inspector Phil Lamb said: “Keeping people safe in the city is a priority for us and our partner agencies. We work together to make the city as safe as possible however, like most UK cities we do suffer from crimes relating to drug activity which bring harm and violence into our communities.
“You are our eyes and ears out there and you may be seeing drug-related activity in your neighbourhood. We need to know about it so we can take action. Always call 101 to report any suspicious behaviour, we might not always attend, but all the information you give us will help us build up an intelligence picture of what is going on.
Anyone with information about this incident is asked to call 101 and quote 44190077228.
Alternatively, call Crimestoppers on 0800 555 111 and leave information anonymously.