Police say another potential victim has come forward following raids on properties in South Gloucestershire and Bristol as part of an investigation into forced labour and exploitation.
The man, in his 30s, is being looked after by specialist support workers, as are the three men, discovered on Sunday.
This remains an investigation very much focused on locating, safeguarding and protecting victims.
As a direct result of our operation on Sunday, another man has come forward identifying himself as a victim.
This is a positive sign and we are hopeful more people will now feel able to speak out.
– Head of CID, Chief Superintendent Julian Moss
I would like to say to anyone who feels they are a victim, please have the confidence to approach us.
You can feel reassured that we will listen to you and you will be able to get all the help and advice you need.
Six people have been arrested in connection with this operation so far, two for slavery offences, two for drugs and two for money laundering.
They have all been bailed to dates between mid-January and late February to allow us time to carry out further enquiries.
Julian Moss, head of CID at Avon and Somerset Police, says often victims of slavery are unaware of their own circumstances.
His comments come after three men were freed yesterday in series of raids as part of Operation Wanderer. 7 people were arrested - six have since been released on bail.
Six people arrested after a series of police raids uncovered men allegedly being kept as slaves have been released on bail.
The three men were freed yesterday when Avon and Somerset police carried out the raids on three traveller sites, a business unit and a house in South Gloucestershire.
A 63 year old man remains in custody.
Chief Superintendent Julian Moss speaks about the raids that led to three men being taken to a place of safety.
The three men believed to be victims of slavery were freed following five weeks of investigations by detectives. This morning they raided three travellers sites in South Gloucestershire: Northwood Park, Tall Trees and Green Orchard.
Further raids were mounted at Green Acres Business Park and on two properties in Bristol, one in Kingswood and the other in Redland. The nationality of the men freed is not yet known.
A "significant quantity" of cash was found at one address, while a suspected stolen trailer and cannabis plants were seized from a farm in Yeovil.
Avon and Somerset Police and Crime Commissioner Sue Mountstevens said: "Today's operation clearly highlights the unacceptable and illegal crime of human trafficking.
"It shows that modern slavery is happening around us and I am pleased that the police, local authorities, and the charity Unseen UK have worked together to tackle and disrupt this abhorrent network of criminality.
"It is only by agencies and local communities working together that this crime against humanity will be stamped out. There will be a long road to recovery for the victims and I am reassured that they are getting as much support as possible."