Kweku Adeboli, a former trader convicted of fraud in 2012, is facing deportation to Ghana after being detained at Livingston police station.
He served four years of a seven-year sentence for a £1.4bn fraud at Swiss bank UBS. He was released in 2015.
Read: Kweku Adoboli to be deported from UK
Foreign nationals sentenced to more than four years are automatically considered for deportation.
His spokesperson said he was being held at Scotland’s Dungaval Immigration Removal Centre.
The spokesperson added that the Home Office has indicated its intention to deport him on or soon after 10 September.
Read: Ghanaian facing deportation from US for sexually abusing stepdaughter
He was detained when attending a monthly check-in at Livingston police station.
Adeboli is Ghanaian but has lived in the UK since the age of 12.
Source:Â bbc.com