Major League Baseball on Tuesday is expected to announce a new policy against harassment and discrimination based on sexual orientation.

According to the AP, the league will announce the new policy before the 2013 All-Star Game at Citi Field. Expected to attend the news conference are MLB Commissioner Bud Selig, MLB Players Association Executive Director Michael Weiner and New York State Attorney General Eric T. Schneiderman, who helped draft the new policy. Schneiderman announced similar protections for National Football League (NFL) players earlier this year.

The policy will create a workplace code of conduct for players and a system for reporting incidents. Players who file a complaint will be protected from retaliation.

Selig told the AP that baseball has “zero tolerance” for discrimination.

Neither the MLB nor the NFL has an openly gay player. Players from both leagues, however, have come out in retirement. In 1999, four years after his retirement, outfielder Billy Bean announced he's gay, and last year former Pittsburgh Pirates owner Kevin McClatchy came out gay.

(Related: Kevin McClatchy on an openly gay baseball player: It's going to happen.)