The Irish Independent reports Herrera could be set for a court appearance after a long-running match-fixing scandal took a fresh twist.
Herrera played for Real Zaragoza in a match against Levante back in 2011, which has been the subject of an extensive and long-running investigation by Spanish authorities.
Prosecutors in Spain are investigating whether some of the Zaragoza players were party to a deal which allegedly saw cash payments made to Levante players in return for a favourable result.
Numerous players, as well as coaching staff at sporting directors of the two clubs could be called to explain why they received two large payments - reported to be £44,000 and £35,000 in Herrera's case - which he is then said to have immediately paid back to the club.
The allegations suggest that the returned cash was then handed over to Levante players, with Herrera issuing a statement reaffirming his stance that he had no involvement in any wrongdoing.
"As I stated back in 2014 when this issue was raised, I have never had and never will have anything to do with to do with manipulating match results," his statement read.
"If I am ever called to testify in a judicial hearing, I will be delighted to attend as my conscience is totally clear. I love football and I believe in fair play, both on and off the pitch."