Athletics pitcher Brett Anderson is no longer an option to start Thursday's game at Detroit, MLB.com reports. Anderson is likely to be activated in Detroit, but should pitch out of the bullpen for the Tigers. 

"We're going to have a tough time starting Brett [Anderson] at this point," manager Bob Melvin said Monday. 

Melvin said Bartolo Colon is likely to start Thursday, though he's not ruling out Jesse Chavez as an option if Colon can't go.