Schlittler (back) threw a bullpen session Tuesday, Gary Phillips of the New York Daily News reports.
Schlittler dealt with some inflammation in his back last week when he reported to camp, but the 25-year-old right-hander is past the issue and has resumed normal mound work. Schlittler made his MLB debut last season, making 14 regular-season starts for the Yankees, and posted a 2.96 ERA, 1.22 WHIP and 84:31 K:BB across 73 innings. He should man a spot in New York's Opening Day rotation.