The Red Sox activated Slaten (elbow) from the 15-day injured list Monday, Jen McCaffrey of The Athletic reports.
Slaten has been shelved since just before the All-Star break with right elbow inflammation, but he's been cleared to return after allowing one run while retiring one batter in his lone rehab appearance. The righty has been an excellent find for the Red Sox as a Rule 5 pick, having collected a 3.38 ERA and 45:9 K:BB over 42.2 frames.