Edwin Jackson will be back in a Nationals uniform on Tuesday. (Greg Fiume/Getty Images)

CINCINNATI — Nearly five years after throwing his last pitch in a Nationals uniform, Edwin Jackson will return to the club Tuesday to start against the Angels, according to a person with knowledge of the situation.

The Nationals need a fifth starter for the remainder of the season after their worst fears were confirmed and Joe Ross was lost until at least 2018 with a torn ulnar collateral ligament. Jackson, who has spent the last month with Class AAA Syracuse, will get the first shot at seizing the role in Los Angeles. Jackson isn’t on the 40-man roster, but moving Ross to the 60-day disabled list would free a spot for him.

The 33-year-old right-hander last pitched out of the bullpen Friday, putting him on turn for Tuesday’s start. He allowed his first run with Syracuse during the three-inning outing after throwing 17 1/3 scoreless innings in four starts. He’s pitched to a 1.44 ERA with 39 strikeouts and 20 walks.

Jackson began the season with the Orioles’ Class AAA affiliate before pitching in three games for Baltimore. He allowed seven runs (four earned) in three relief appearances before he was designated for assignment. He then signed a minor-league contract with the Nationals in mid-June, which includes an opt-out clause he can exercise on Aug. 1 if he isn’t on the big-league roster by then.

Jackson, who has pitched for 12 major league clubs, went 10-11 with a 4.03 ERA in 31 starts and appeared in two playoff games for the Nationals in 2012.