Burnett, 36, has been on the disabled list since suffering a Grade 1 tear in his right calf last month. He threw a bullpen session to test the calf on Thursday. Burnett did not make any minor league rehab starts.
Burnett was 4-6 with a 3.12 ERA and 1.13 WHIP in 14 starts before the injury. His strikeout rate (9.96 K/9) is the fifth-highest in baseball.
Right-hander Jeanmar Gomez was scheduled to start Sunday and may go back to the bullpen.St. Louis Cardinals