"Belisario provides us with a veteran reliever who owns a proven record of recording key outs at big moments of games," White Sox general manager Rick Hahn said in a statement. "He is a power arm with plus stuff who profiles well for our ballpark. He has experience pitching in hold and save situations, and we see him as yet another very strong option for [manager] Robin Ventura in the back end of our bullpen."
In four Major League seasons, Belisario has posted a career ERA of 3.29, while allowing just 7.6 hits per nine innings. Control has occasionally been a problem, however, and his career WHIP sits at 1.24.
After missing the entire 2011 season while on the restricted list, Belisario went 8-1 with a 2.54 ERA in 2012, his most successful season to date.
Belisario is scheduled to be arbitration-eligible following the 2014 and '15 seasons, and he will not be eligible for free agency until after the '16 campaign.
With the move, the club's 40-man roster is full.
Ken Rosenthal and Jon Paul Morosi of MLB Network and FoxSports.com reported Thursday the White Sox were also set to sign left-handed reliever Scott Downs to a one-year deal. The club has not made any comments on Downs.
AJ Cassavell is a reporter for MLB.com. Follow him on Twitter @ajcassavell. This story was not subject to the approval of Major League Baseball or its clubs.