BOSTON — The Boston Red Sox signed first baseman Nathaniel Lowe to a one-year contract Monday, two days after he was released by the Washington Nationals. To make room on the roster, the Red Sox placed outfielder Rob Refsnyder on the 10-day injured list with a strained muscle on his left side.

The Red Sox shook up their bullpen on Tuesday, calling up a left-hander ahead of the series finale against the Orioles.

The Red Sox and first baseman Nathaniel Lowe are in the final stages of a contract, according to ESPN’s Jeff Passan . MassLive’s Chris Cotillo reported earlier that Lowe and the Sox were in discussions and were “ working on getting it done.” Lowe is represented by SportsMeter.