O'Gara has received a qualifying offer from the Rangers.
O'Gara played in eight games for Boston and 22 for the Rangers, notching three points in 2017-18.
O'Gara recorded an assist and four shots in Thursday's 4-3 loss to the Flyers.
O'Gara was sent down to AHL Providence on Saturday, TSN reports.
O'Gara was recalled from AHL Providence on Monday.
O'Gara has been sent to AHL Providence.
O'Gara was recalled from AHL Providence on Saturday, Steve Conroy of the Boston Herald reports.
With Torey Krug sidelined, O'Gara is competing with Matt Grzelcyk for a spot on the Boston blue line to start the coming season, CSN New England reports.
O'Gara was sent down to the minors Tuesday.