Smith (forearm) is tentatively scheduled to begin his rehab assignment Tuesday at Triple-A Pawtucket, Tim Britton of the Providence Journal reports.
Smith is set to make an appearance in an extended spring training game Saturday and if all goes well, he'll set out on his rehab assignment Tuesday. The Red Sox have said that Smith will need three rehab appearances before coming off the disabled list, making an early May return a possibility. Smith started the season on the disabled list after suffering a forearm strain in spring training.