What happened: San Francisco 49ers defensive end Mykel Williams is considered a longshot to play in the regular-season opener. Head coach Kyle Shanahan provided the update on the pass rusher.

Why it matters: Williams is currently working his way back from a knee injury. His potential absence would thin the depth of the defensive line rotation for the start of the year.

What to watch: The team will continue to monitor his recovery as the preseason concludes.