Seven more players from unnamed Football League clubs based in the north west of England have been arrested in connection with alleged spot-fixing and another six rearrested over the claims.
The 13 footballers, aged between 18 and 30, are being interviewed at police stations across the country after they were held as part of an investigation into alleged bribery and money laundering, the National Crime Agency said.
In December the original six suspects were arrested as part of the inquiry, prompted by information passed on by the Sun on Sunday, and were bailed to return on April 8.
A national newspaper alleged six Preston North End players were among those arrested on Thursday.
A Football League spokesman 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.”
The Football Association released a brief statement which read: “The FA has been made aware of developments in relation to an ongoing NCA (National Crime Agency) 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.”
Preston North End said in a statement on the club website on Thursday night: “In response to media inquiries received, Preston North End Football Club can confirm that today, April 3 2014, the club has been contacted by the National Crime Agency in relation to a wide-ranging investigation into ‘spot fixing’ in football.
“There are no suggestions that any offences that might have occurred involved match-fixing.
“None of our employees have been charged with any offence at this time and until or unless this position changes we will be taking no further action nor making any further comment.
“All of our contracted employees are available for selection by the manager.”