Crabtree started and played three of the first four snaps during Sunday's preseason game against the Broncos, but he failed to catch the only pass thrown his way. Crabtree had been dealing with a hamstring injury this week, but he resumed full practice Friday before participating in Sunday's game. After missing significant time last season with an Achilles' injury, the 49ers will make sure Crabtree is fully healthy heading into the regular season, which means he isn't likely to play a big role in either of the remaining preseason games.