Allen was diagnosed with a shin bruise on his left leg that he suffered during Saturday's training camp practice, Adam Schefter of ESPN reports.
It's a best-case scenario for the rookie fifth-rounder, who had to be carted off the field after sustaining the injury on a special teams drill. Per Sam McDowell of The Kansas City Star, the Chiefs consider Allen day-to-day, which puts the young wideout on track to be available for the team's preseason opener against the Rams on Saturday, Aug. 15.