Mostert didn't participate in Wednesday's OTA session due to a knee issue, but he's expected to be fine for training camp, Matt Maiocco of NBC Sports Bay Area reports.
Mostert put together a strong showing in his eight games for the 49ers last season, but he had trouble staying on the field and finished the campaign on injured reserve due to a high-ankle sprain. Unfortunately, he appears to be starting the offseason on the mend from an injury, but this latest one isn't expected to cost him many meaningful reps. Even if he's back to full strength for Week 1, Mostert may face more competition for reps in 2021 with the 49ers investing draft picks into Trey Sermon (No. 88 overall) and Elijah Mitchell (No. 194 overall) in the spring and adding ex-Giant Wayne Gallman on a one-year deal.