Francisco has 73 career saves and a 3.93 ERA in nearly 400 major league appearances over nine seasons, all in relief. He spent part of the last two seasons in the New York Mets organization, pitching in only eight games in 2013 after recovering from elbow surgery.
The White Sox's bullpen is last in the American League with a 6.93 ERA and is tied for the league lead with 26 walks. Teams are batting .295 against White Sox relievers, the highest average in the AL.
Matt Lindstrom has struggled in the closer's role, posting a 5.40 ERA over his first five outings. He blew the save in Sunday's game against the Cleveland Indians, but ended up with the victory when the White Sox rallied on a two-run home run from Alexei Ramirez.