Slaten (elbow) is scheduled to throw a bullpen session Monday and start a minor-league rehab assignment shortly thereafter, Ian Browne of MLB.com reports.
Slaten will incorporate an up and down into Monday's bullpen before embarking on what's expected to be a brief rehab assignment. The 26-year-old has been on the shelf since July 12 due to elbow inflammation. The issue wasn't expected to sideline Slaten for more than the minimum 15 days, but his recovery was thrown off schedule by an illness.