The White Sox optioned Cannon to Triple-A Charlotte on Sunday.
Cannon's first stint in the big leagues lasted three turns through the rotation, with the rookie right-hander going 0-1 with a 7.24 ERA, 1.76 WHIP and 13:4 K:BB in 13.2 innings across those starts. The White Sox have a day off Thursday and could get by with a four-man rotation until Mike Clevinger is fully stretched out for starting duty and ready to make his season debut, which could come as soon as next Sunday.