NEW YORK—Kansas City Royals pitcher Eric Skoglund was suspended Wednesday for the season’s first 80 games after testing positive for two performance-enhancing substances.

The MLB commissioner’s office said the positive tests were for selective androgen receptor modulators S-22 (Ostarine) and LGD-4033 (Ligandrol).

Royals general manager Dayton Moore said in a statement Skoglund “unknowingly made a mistake” and “we remain proud of who Eric is as a person and will support him as an organization.”

Gregory Soto, the Detroit Tigers’ left-handed pitching prospect who was named the organization’s minor league pitcher of the year two seasons ago, has been suspended 20 games.

Soto’s suspension for “Conduct Detrimental or Prejudicial to Baseball” was announced on Friday afternoon by Major League Baseball, citing Article 12, Part B of the collective bargaining agreement as the offense.

Article 12, Part B reads, “Players may be disciplined for just cause for conduct that is materially detrimental or materially prejudicial to the best interests of Baseball including, but not limited to, engaging in conduct in violation of federal, state or local law. The Commissioner and a Club shall not discipline a Player for the same act or conduct under this provision. In cases of this type, a Club may only discipline a Player, or take other adverse action against him, when the Commissioner defers the disciplinary decision to the Club.”