Mr Lubbock had been invited to the house after meeting Mr Barrymore and his companions at the Millennium nightclub in Harlow. But the events of the party still remain a mystery 20 years later.
Last month, detectives revealed they were planning to contact the former TV star and other men who were at a “drink and drug-fuelled party” which resulted in the death of Mr Lubbock.
A 50-year-old man was arrested on suspicion of Mr Lubbock’s murder last month but was later released.
Mr Barrymore reportedly met with Essex Police last week and was quizzed if any new information “might have come to mind” over the last 20 years.
Mr Barrymore’s ex-agent, Mike Browne, told the Sun: “The police asked us if we had anything new that might have come to mind in the last 20 years but we don’t.
“Everything we know we’ve said.
“We both just want this to be resolved for everyone’s sake.”
The renewed questioning comes after Mr Lubbock’s ex-wife Sue Homan said Mr Lubbock’s cancer-stricken father, Terry, is “positive” they will get justice.
She said: “Terry is still positive we will get justice.
READ MORE: Michael Barrymore fights tears speaking on Mr Lubbock’s death
He also had severe “sexual injuries” from being raped.
Mr Lubbock was pulled from the pool but died in hospital, with pathologists saying the most likely cause of death was drowning.
Jonathan Kenney, Mr Barrymore’s former partner and dustman Justin Merritt were arrested at the time but were both later released without charge.
Mr Barrymore was not at the house when police arrived but was interviewed later.
He was cautioned for possessing cannabis and letting his premises be used for drug-taking.
In June 2007, Mr Barrymore was arrested along with Mr Kenney, then 37, and Mr Merritt, then 32.
No charges were brought and all three men denied any part in Mr Lubbock’s murder.
Mr Barrymore, whose real surname is Parker, successfully sued Essex Police for wrongful arrest and was awarded nominal damages following a ruling at the Court of Appeal.
In 2009, the police watchdog published the findings of a review of the investigation into Mr Lubbock’s death.
It concluded that officers missed crucial evidence and did not ensure vital forensic tests were completed until six years later.
Items, including the swimming pool thermometer, went missing from the scene.
Mr Barrymore’s television career collapsed in the wake of the allegations, although he enjoyed a brief return to the spotlight during a stint on Celebrity Big Brother in 2006.
Express.co.uk has contacted Mr Barrymore’s representatives offering him a chance to respond.