Johnson (elbow) is expected to toss a bullpen session Tuesday, Charlie Goldsmith of Fox 19 Now Cincinnati reports.
Johnson last pitched May 26 before landing on the 15-day IL due to right elbow inflammation, retroactive to May 27. He's set to test out the elbow with mound work Tuesday, and a minimum-length stay on the injured list remains a possibility. Johnson could bypass a minor-league rehab assignment if Tuesday's throwing session goes well.