What happened: Adam Schefter reported the move Wednesday after Stribling suffered an ankle injury in the opener. The transaction removes him from San Francisco's active roster for the opening stretch of the regular season.

Why it matters: It is another setback for the 49ers' No. 33 pick from April after he had already been expected to miss about a month. Early-season injured reserve thins San Francisco's receiver depth and pauses a notable rookie's first-year role.

What to watch: San Francisco's next roster moves will show how it plans to Stribling becomes eligible to return after the four-game minimum.