Sale (elbow) is expected to throw four or five innings in his rehab outing with Double-A Portland on Sunday, Steve Hewitt of the Boston Herald reports.
The outing will mark Sale's third rehab appearance. In his last start, he threw 3.2 innings and built his pitch count up to 49, and he should have the chance to build on that number Sunday. Sale will still likely need at least one or two additional rehab outings prior to being activated by the Red Sox, though his return from Tommy John surgery remains on track.