The NFL suspended a swath of players last month for gambling violations and could be in line to dole out more penalties following a second investigation.

The league is investigating a «second wave of possible violations of its gaming policy,» ESPN reported Monday. It is unclear at this time who the targets of the investigation are.

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A person places bets during a watch party for the NCAA Men’s College Basketball Tournament at the Westgate Las Vegas Resort & Casino on March 15, 2018. (Ethan Miller/Getty Images)

The NFL has been in the know ever since the Supreme Court paved the way for the legalization of sports betting a few years ago. The league has been working with sportsbooks and integrity firms to monitor the betting market and flag inappropriate bettors, according to ESPN.

«We have long been focused on expanding our monitoring efforts, working with a variety of tools and resources while staying in sync with the growing regulated market,» David Highhill, who oversees sports betting for the NFL, told ESPN. «Our monitoring efforts include internal measures, along with resources and services provided by our partners to ensure that we have the most complete information possible.»

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NFL logo on the field

The NFL logo on the field at Hard Rock Stadium on December 25, 2022 in Miami Gardens, Florida. (Megan Briggs/Getty Images)

In April, the NFL suspended three players indefinitely and two others for six games after gambling policy violations.

Quintez Cephus, CJ Moore and Shaka Toney received indefinite suspensions through the 2023 season for betting on NFL games during the 2022 season, according to the NFL. Stanley Berryhill and Jameson Williams each received six-game suspensions.

Jacksonville Jaguars wide receiver Calvin Ridley has been reinstated by the NFL following a one-year suspension for betting on NFL games while with the Atlanta Falcons.

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Guests watch the World Series at Circa Resort & Casino on October 27, 2020 in Las Vegas. (Ethan Miller/Getty Images for Circa Resort & Casino)

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The Pro Bowler was suspended after he was found betting over a five-day stint on NFL games in November 2021 when he was out of the team on the non-football illness list.

Fox News’ Joe Morgan contributed to this report.