Smith suffered a strained oblique muscle in the Arizona Fall League, Adam Rubin of ESPN New York reports.
One of the club's top prospects, Smith had an impressive season with High-A St. Lucie in 2015, slashing .305/.354/.417 with six homers and 79 RBI in 118 games. The oblique injury shouldn't effect his availability for the spring, but it could end his AFL stint early.