The hiring gives Rolston two assistants, including Teppo Numminen, who was on the staff in 2012-13.
"Obviously we’re really happy to have [Sacco] in the organization," Rolston told the Sabres website. "[He has] tremendous experience, work ethic. [He’s a] teacher. [He] has coached a young team in Colorado, so all things that were bonuses for our organization, along with the character that he brings to the table and the dedication that he's going to bring here to work with our team."
Sacco spent four seasons as coach of the Colorado Avalanche; hired prior to the start of the 2009-10 season, he was fired following the 2012-13 season. The Avalanche finished 15th in the Western Conference with 39 points, the second-fewest in the League.
The Avalanche made the Stanley Cup Playoffs in Sacco's first season, finishing eighth in the Western Conference with 95 points, a 26-point improvement from the previous season. The Avalanche lost in six games to the San Jose Sharks in the Western Conference Quarterfinals.
That was the only time Sacco was able to get the Avalanche into the postseason.
"As a player, he was a player that was a heart-and-soul player, somebody that you could depend on every night," Rolston said of Sacco. "You knew what you were getting, and those are some of the same qualities we're asking for from our guys at this point."