Conner was signed to a one-year contract and Ebbett was inked to a two-year deal this summer.
Conner, 29, spent last season with the Phoenix Coyotes, but played the majority of the year in the AHL with their affiliate, the Portland Pirates.
In 12 regular-season contests for Phoenix, Conner registered two points (1G, 1A) and skated to a plus-3 rating. While with Portland, he recorded 40 points (13G, 27A) and skated to a minus-9 rating in 60 games.
Ebbett, 30, spent last season with the Vancouver Canucks and their affiliate in the AHL, the Chicago Wolves. In 28 games with Vancouver, Ebbett recorded six points (1G, 5A) and skated to a minus-1 rating. Performing in 37 contests for the Wolves, he scored 32 points (11G, 21A) and skated to a sufficient plus-10 rating.
Pittsburgh is now down to 27 skaters and must meet the roster limit by Monday; however, due to Matt D’Agostini and Kris Letang’s injuries, they could complicate the situation..
Expect more moves to be announced later Sunday night.