A 52-year-old man has been arrested at Juice Bros in Bury St Edmunds on suspicion of immigration offences.
Police visited the restaurant in arc shopping centre on Friday, June 14 following reports of suspected exploitation.
Officers carried out checks and arrested the man on suspicion of immigration offences. A spokesman for Suffolk police said he will be dealt with by immigration services.
It is one of two arrests in connection with slavery offences in recent months.
A 37-year-old man was arrested on suspicion of slavery, servitude and forced or compulsory labour after officers carried out a warrant at a massage parlour in the St Olaves precinct in Bury St Edmunds.
He remains on police bail until Thursday, July 11.
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It comes as Suffolk police launches its Modern Slavery Awareness Week campaign.
A spokesman for Suffolk police said: "The aim is to highlight this hidden crime, raise awareness on how to spot the signs and encourage the public to report any concerns.
"The focus for this awareness week is within the care home sector, which nationally is an increased target for labour exploitation, fraud and illegal working due to understaffing."
Detective chief inspector Anna Powell said: “Unfortunately, care homes, the beauty industry, food processing and hand car washes are all areas where we know exploitation sometimes takes place in Suffolk and we need the public to be aware of how to recognise abuse and know how to report concerns so that we can help safeguard victims and pursue offenders.
“Our dedicated Modern Slavery and Vulnerability team work alongside local authorities and welfare partners to share information and intelligence on exploitation and abuse and address the longer-term safeguarding needs of victims.
"We also work with businesses within each sector to help them identify victims who may be coerced into labour by organised crime groups."
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