Smith (elbow) will be shut down for 4-to-5 days due to shoulder inflammation, Brian MacPherson of the Providence Journal reports.
The Red Sox aren't too concerned about this issue, as it's pretty common for players returning from Tommy John surgery to have some residual soreness as they ramp up their activity level. However, this does mean that he won't be able to make his rehab appearance Sunday as planned, although he'll likely just slide it back a week or so to accommodate this development. Smith still has a chance of returning before the All-Star break if all goes as planned.