Rusin, 27, has appeared in 20 games for the Cubs over the last two seasons, all as a starter. He’ll initially pitch in relief as the Cubs have played three extra-inning games so far and seven of 10 have been decided by two runs or less. They’re in need of a long reliever as Carlos Villanueva is in the starting rotation until Jake Arrieta returns from shoulder problems.
Rusin is 4-9 with a 4.69 ERA over two seasons. Schiltter, 28, was a surprise addition to the roster out of spring training but isn’t suited for long relief. He had a 6.35 ERA in six appearances this season.