Marcum will join the Indians on Wednesday to make a start against the White Sox, Paul Hoynes of the Cleveland Plain Dealer reports. Marcum previously made one appearance with the big club earlier this season, giving up one run over a five-inning relief outing back on April 12. He's since been biding him time at Triple-A Columbus, where he's impressed with a 4-0 mark and 1.36 ERA over 33 innings. The Indians will need to clear out a 40-man spot for Marcum, but he could stick around as the team's fifth starter until T.J. House (shoulder) returns from the DL.