All the men - aged between 18 and 30 - are from Football League clubs based in the north west of England and are being interviewed at police stations across the country, according to the National Crime Agency.
In December, the original six suspects were arrested as part of the inquiry, prompted by information passed on by a Sunday newspaper, and were bailed to return on 8 April.
Following today's developments the Football Association has released a brief statement.
The statement read: "The FA has been made aware of developments in relation to an ongoing NCA investigation, including a number of further arrests.
"We are liaising with the authorities in relation to these allegations. The FA will make no further comment at this time."
A spokesman for the Football League said: "The Football League has been made aware that a number of arrests have been made in relation to an ongoing police investigation.
"We will provide our full co-operation to the relevant authorities. Given that it is an ongoing matter, we cannot comment further at this time."