Brett Gardner is back with the Yankees — officially.

The longtime outfielder agreed to a new deal with the team last month, but didn’t take a physical until Tuesday and the Yankees announced the deal Saturday.

Gardner returns on a one-year contract worth $12.5 million with a $10 million option for 2021 that includes a $2.5 million buyout.

To make room for Gardner on the roster, Stephen Tarpley was designated for assignment.

Coming off a season in which he set career highs in homers with 28 and an OPS of .829, Gardner was expected to be back in The Bronx — especially with Aaron Hicks out likely until June at the earliest following Tommy John surgery on his right elbow in October.

Gardner, 36, figures to play regularly in center, with fellow lefty swinging Mike Tauchman another option to fill in for the switch-hitting Hicks, who returned from an elbow injury during the playoffs, but then further injured it.

Hicks, 30, signed a seven-year, $70 million extension last spring, but was limited to 59 games during the regular season in 2019.

The longest tenured Yankee, Gardner’s presence in the clubhouse will be even more important this season after the departures of CC Sabathia, Didi Gregorius, Dellin Betances and Austin Romine.

The 26-year-old Tarpley appeared in 21 games for the Yankees last season and was mostly ineffective. He allowed six homers in just 24 2/3 innings and had an ERA of 6.93.

Acquired in the 2016 deal that sent Ivan Nova to the Pirates, Tarpley made the postseason roster in 2018, when he gave up three runs in one innings in a blowout loss to Boston in Game 3 of the ALDS.

He’d been good against left-handed hitters, but could be more impacted than others by the new MLB rule being implemented this season that forces pitchers to face at least three batters or finish an inning in an appearance. The rule was put in place to try to improve pace of play, but will hurt lefty specialists.