Crawford suffered a hairline fracture of his pinky finger during Monday's game against the Angels, Ryan Divish of The Seattle Times reports.
Crawford will require a trip to the 10-day injured list, though the timeline for a potential return remains uncertain. Dylan Moore should see opportunities at shortstop until Crawford returns to health, and the Mariners could also recall Ryan Bliss, who was optioned to Triple-A Tacoma earlier in the day.