Just after 3 p.m. Friday at the Stadium, Aroldis Chapman threw in the outfield in a gray t-shirt and blue shorts. After 20 minutes, the Yankees closer walked into the home dugout and through the tunnel back to the clubhouse. There, he packed his duffle bag for what will be the final steps before he returns to the major leagues for the first time in a month.

Chapman — who hasn’t pitched since May 12 because of left rotator cuff inflammation — was scheduled to fly to Tampa Friday night. On Saturday, he will throw a simulated game at the Yankees’ spring training facility. Then he will depart for a minor-league rehab outing for Double-A Trenton.

Joe Girardi said Chapman will pitch for the Thunder on either Monday or Tuesday. But Trenton is off Monday. They play at the Hartford Yard Goats on Tuesday.

Chapman believes he’ll only need one rehab appearance before rejoining the Yankees. The hard-throwing lefthander is eyeing next Friday night’s game at the Athletics as a possible return date. Girardi said the Yankees will re-evaluate their plan after Chapman’s rehab outing, depending on how he feels.