Joshua Green, 27, was stabbed to death on the dancefloor at the Stars Suite in Queens Road in the early hours of New Year’s Day.
Yesterday two men aged 22 and 19, who were released earlier in the week on suspicion of murder, were released pending further enquiries.
Officers working on the murder investigation are continuing with CCTV examinations and forensic analysis of the samples already gained.
Police say they are also concentrating on tracing potential witnesses who were in the club at the time of the murder.
Detective Superintendent Andy Thompson said: “We’re progressing with the investigation and have identified a number of people who were at the party in which Joshua Green was stabbed.
“However, this will take some time due to the number of party goers present. We’d still like anyone who was out at the club that night, to please come forward to help.”
Anyone who was at the party should call 0114 2963159.