Left-handed pitcher Aroldis Chapman, who’s turned heads all over the Triple-A International League by routinely reaching triple figures on radar gun readouts with his out-of-this-world fastball, is expected to be called up from Louisville before Cincinnati’s game Tuesday against Milwaukee.

“We’re going to bring him up tomorrow so he could be eligible for the playoffs,” general manager Walt Jocketty said.

The move would automatically make Chapman eligible for postseason play. Generally, players must be on a team’s 25-man active roster by Aug. 31 to be eligible for the playoffs, which is one reason the Reds plan to activate right-hander Aaron Harang in time to start Tuesday against the Brewers.

Chapman was expected to be among the players called up by the Reds when active rosters can be expanded beyond 25 players on Sept. 1, but if they wanted him to be eligible for postseason play, they would have had to make a special roster move.

According to assistant general manager Bob Miller, there are certain scenarios under which a player could join the team after Aug. 31 and still be eligible for postseason play. One is if he is named to replace a player who’s on the 60-day disabled list. The Reds have two such players: pitchers Jose Arredondo and Mike Lincoln.

“He could be part of the pool [of players], but we decided to bring him up early,” Jocketty said.

Chapman, 22, is 9-6 with eight saves and a 3.57 ERA in 39 games, including 13 starts. He has racked up 125 strikeouts with 52 walks and held opposing batters to a .218 batting average in 95 2/3 innings.