Mark Eaton played in 218 games with the Penguins from 2006-10.
Evgeni Malkin is helped up after taking a hit along the boards in the third period Feb. 22. He left the game and did not return.
By Shelly Anderson Pittsburgh Post-Gazette
The Penguins today signed defenseman Mark Eaton to a one-year, $750,000 contract.
Eaton, 35, is a stay-at-home defenseman and was a member of the Penguins' 2009 Stanley Cup team. He had been practicing with the team in an informal arrangement, and Eaton has said he was hopeful it would lead to a contract.
Earlier this season, Eaton played six games with the Penguins' American Hockey League affiliate on a professional tryout agreement. He spent the previous two seasons with the New York Islanders.
To make room for Eaton on the roster, the Penguins placed center Evgeni Malkin on injured reserve. Malkin has a concussion and has been ruled out of playing on a three-game road trip that begins Tuesday at Florida. He could be activated from IR as soon as this weekend, with the Penguins then having to reduce its roster by one.