Falter (triceps) will begin a rehab assignment with Triple-A Indianapolis on Wednesday, Noah Hiles of the Pittsburgh Post-Gazette reports.
Falter has been out since early July with left triceps tendinitis but is feeling well enough to kick off a rehab assignment. The left-hander could be ready to return from the 10-day injured list by early next week if his outing goes well Wednesday, but an additional rehab outing might be a likelier outcome.