Heineman (hamstring) was reinstated from the 10-day injured list and optioned to Triple-A Worcester on Saturday, Gabrielle Starr of the Boston Herald reports.
Heineman has been out since April 23 with a right hamstring strain, but he'll now return to regular action at Triple-A. The catcher has produced a .235 average with a double, three RBI, eight runs scored and two stolen bases over 34 at-bats in 12 games with Worcester this season. Both Connor Wong and Reese McGuire are healthy at the major-league level, but Heineman is likely the next man up if Boston needs another backstop down the road.