Davis, currently in his seventh year in the league, is serving a 25-game suspension for the use of Adderall, which is banned by Major League Baseball.
With five games remaining to be served, Davis would not be able to play in the series until Game 6.
Despite not being listed on the team's roster for the championship series, Davis is still expected to be in attendance.
Davis has not played since Sept. 10, when Baltimore closed out a three-game stand against the Red Sox in Boston. In his last game, Davis had a hit and two strikeouts in five at-bats.
Before his suspension, Davis was hitting .196 with a .404 slugging percentage. He had 26 home runs and 72 RBI in 127 games.
The Orioles finished a sweep of the Detroit Tigers in the ALDS on Oct. 5. They begin the best-of-seven series against the Kansas City Royals on Friday at home. Should the Orioles advance to the World Series, Davis would be able to rejoin the team.
- Christopher Woody