The remains of three of the Disappeared may be buried close to where the body of Brendan Megraw was found in a Co Meath bog, according to a co-commissioner of the Independent Commission for the Location of Victims Remains.
Mr Megraw’s remains were found in Oristown Bog last month and were formally identified through DNA.
Speaking on RTÉ’s Morning Ireland, Frank Murray said he believed the remains of three other Disappeared victims, Joe Lynskey, Seamus Wright and Kevin McKee, may be in the vicinity of Oristown Bog.
Mr Murray said he was confident that there were people who could provide the information the commission needs to locate the remains of the Disappeared.
Mr Megraw, 23, from Twinbrook, Belfast was looking forward to the birth of his first child and was due to start a new job on a ship when he went missing in April 1978.
He was one of 17 people abducted, killed and secretly buried by republicans during The Troubles.
It brings to 11 the remains of the Disappeared that have been recovered so far.
Minister for Justice Frances Fitzgerald said the identification of Mr Megraw's remains will allow "another chapter to be closed in the tragic saga of the Disappeared".
She said: "For a family to be bereaved but denied the opportunity to bury their loved one is a trauma that is hard to imagine. I want to express my sympathy to the Megraw family at his time."
The minster urged anyone with information on the Disappeared to contact the commission in confidence.