Willis scheduled for MRI on groin
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SANTA CLARA – All-Pro linebacker Patrick Willis is scheduled to undergo an MRI examination Monday on his groin, 49ers coach Jim Harbaugh said.

Willis, who sustained the injury while in pursuit of Indianapolis Colts wide receiver Reggie Wayne on a late-third quarter play, is not expected to be ready for the 49ers’ game Thursday night against the St. Louis Rams.

Said Harbaugh, “We’ll leave that to the evaluation and the opinion of the doctors.”

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Third cornerback Nnamdi Asomugha is also scheduled to undergo an MRI on his right knee, Harbaugh said. Asomugha was injured on a fourth-quarter play while tackling Colts running back Ahmad Bradshaw.

The 49ers will continue to evaluate tight end Vernon Davis, who sat out Sunday’s 27-7 loss to the Indianapolis Colts with a left hamstring strain. Harbaugh said it is not known whether Davis will be available to play against the Rams.

One player who definitely will not be available is outside linebacker Aldon Smith, who reportedly was on his way to undergo treatment for substance abuse. Smith was arrested Friday morning on suspicion of driving under the influence and possession of marijuana.

Smith played all 72 snaps for the 49ers on Sunday against the Colts. He will be out indefinitely, and he is expected to be placed on the non-football illness list.

When asked if there were regrets about playing Smith on Sunday, Harbaugh said, “(I’m) not going to rehash it. The decision was made and we went over it last night. We did what we felt was in the best interest of the team and the best interest of the player long term.”