The Guardians are planning for Armstrong to cover one inning and around 20-to-25 pitches in the appearance, which will be his first since April 21. Armstrong is working his way back from a right groin strain and probably won't need to throw more than a couple of innings on the farm before the Guardians feel comfortable bringing him back from the 15-day injured list.

Walters hasn't pitched since April 24. Once he returns to full strength, the right-hander will commence a new rehab stint.

Omaha's game Friday was rained out, but Hernandez should be expected to make a few rehab outings with the club over the next few weeks as he looks to get up to speed. The right-hander missed all of spring training due to a right shoulder impingement.