The Orioles' Opening Day starter last year, Tillman allowed five runs over five innings in his fourth rehab start, but manager Buck Showalter said the reports were mostly good.
Tillman went 16-6 with a 3.77 ERA in 30 starts last year and is 72-48 with a 4.13 ERA in parts of eight seasons.
Crichton called up, Wilson optioned
Seeking to bolster their bullpen, the O's continued their recent roster carousel, optioning Tyler Wilson -- who started and got the win in Thursday's 8-3 victory over the Red Sox -- to Norfolk and recalling Stefan Crichton from there.
Wilson came up in place of Richard Bleier and was one of two roster moves made in advance of Thursday's game. The O's have been scrambling to cover for Kevin Gausman's short start -- on account of an ejection -- Wednesday.
Baltimore has made roster moves in seven of the past eight days, primarily to keep the pitching staff fresh.
Brittany Ghiroli has covered the Orioles for MLB.com since 2010. Follow her on Facebook and Twitter @britt_ghiroli, and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.