State police investigator Andrejs Grišins told Latvian radio arrests had been made, though he declined to name any of those apprehended.
Police worked in tandem with the Latvian Football Federation and European football's governing body UEFA during an investigation Grišins said, with more details set to be released later on Friday.
The LETA news agency quoted police spokesman Dairis Anučins saying the arrests centered on alleged match-fixing involving the Daugava club from Daugavpils and said three members of the coaching and playing staff had been detained including head coach Ivans Tabanovs.
It is not the first time Daugavpils' leading team has been in trouble for match-fixing. In 2009 an earlier incarnation of the team, then named Dinaburg, was kicked out of top-flight football as a result of another UEFA-backed investigation.