Walcott (head) was placed on the 7-day minor-league injured list Sunday, Jeff Wilson of AllDLLS.com reports.
Walcott was struck in the head by a pickoff throw during his contest with Double-A Frisco on Saturday, and he'll now be forced to spend time on the IL as a result. The Rangers' top prospect has posted a .308 average with three home runs, nine RBI, 13 runs scored and three stolen bases over 13 contests since his promotion to Double-A.