South Yorkshire Police will take just two weeks to give the Independent Police Complaints Commission (IPCC) the names and addresses of up to 1,000 officers who were on duty on the day of the Hillsborough disaster.
Chief Constable David Crompton told the Home Affairs Select Committee there were 100 serving officers who were on duty, several hundred retired officers, and a few hundred from other forces.
The Hillsborough disaster cost the lives of 96 Liverpool fans
The IPCC announced a week ago that it was launching the biggest investigation yet into police action after an independent panel reported there was a cover-up in the aftermath of the deaths of 96 Liverpool fans at the 1989 disaster.
Mr Crompton, who agreed under questioning that some police had been "sick" to deflect blame on to fans, said his force was not making decisions about officers' culpability and was leaving it to the IPCC.
The independent panel, which was chaired by the Bishop of Liverpool, the Rt Rev James Jones, made a catalogue of alarming claims including the allegation 164 police statements were altered in the wake of the tragedy, 116 of them to remove or change negative comments about policing of the match and ensuing disaster.
On Tuesday, Mr Crompton said he supported a fresh inquest into the 96 deaths and said that all officers' names and addresses would be supplied to the IPCC within a week and all South Yorkshire Police's work would be finished in two weeks.
He also said he had no qualifications to make to the independent panel's report.
Asked by committee member David Winnick what would represent "closure" for the force, the chief constable said prosecutions if officers had broken the law.
However, he added: "But I don't think it's possible to say one unique thing will represent closure for all the different people involved in the Hillsborough disaster.
"If I was a member of one of the families I don't know if closure would ever be possible.
"And likewise, if I was a young officer there who was traumatised I don't know if there would be closure."
The families of those killed at Hillsborough are looking for action after the independent panel's report
After 23 years of battling for justice it emerged the survivors and families of the dead are still struggling to receive official information about the overall process and developments.
Sheila Coleman, of the Hillsborough Justice Campaign, told chairman Keith Vaz she learned of Tuesday's session via one of his Twitter posts.
Trevor Hicks, who lost two teenage daughters at Hillsborough, told the session with the significant recent developments the families "feel this is only the beginning of closure...now is the time for action".
Former cabinet minister, Lord Falconer of Thoroton, who is advising the families, said he was worried the IPCC investigation would take a long time and more time would then be lost by an investigation by the Director of Public Prosecutions (DPP) to see if charges could be brought for offences such as manslaughter, misfeasance and conspiracy to pervert the course of justice.
Lord Falconer said he and the families agreed that Keir Starmer QC, the DPP, should co-ordinate investigations.