Three people who were due to work as Olympic security staff in Newcastle have been arrested on suspicion of immigration offences, the Home Office said.
They were drafted in to work as security guards at St James' Park but were arrested on Wednesday, just 24 hours before the Mexico and South Korea match at the stadium.
The three were employed by a private security firm, but were not G4S staff, a Home Office spokesman said.
He added: "These arrests show that UK Border Agency security checks are working.
"The responsibility for ensuring that employees have the right to work in the UK rests with the employer.
"The UK Border Agency is working closely with employers and contractors at Olympics venues to prevent illegal working."
Staff from the UK Border Agency made the arrests alongside officers from Northumbria Police after acting on intelligence and carrying out routine checks.
The Home Office were unable to release the nationalities or ages of those arrested.
A Northumbria Police spokesman said: "On Wednesday, July 25, officers carried out a number of arrests in conjunction with the UK Border Agency in connection with suspected immigration offences."