Dana Eveland appears to be the most likely candidate. The only Minor League starter currently on the 40-man roster is John Ely, but he started for Triple-A Albuquerque on Sunday and would be pitching on short rest. Eveland's most recent start was Wednesday.
Eveland, a non-roster invite to Spring Training, has been Albuquerque's most effective starter, going 12-8 with a 4.38 ERA and hurling two complete games. But the 27-year-old left-hander also has been rocked in three of his past four starts.
Another option is 21-year-old Allen Webster, who is 5-3 with a 5.29 ERA at Double-A Chattanooga after going 5-2 with a 2.33 ERA at Class A Rancho Cucamonga. He has been hit hard in three of his past four starts, most recently on Thursday. Webster would be the Dodgers' fifth player from the 2008 First-Year Player Draft to reach the Majors, joining Jerry Sands, Josh Lindblom, Dee Gordon and Nathan Eovaldi.
Eovaldi's start Saturday in Atlanta will be his last of the season, and Mattingly said he will then move to the bullpen to rest his 21-year-old arm.