SANTA CLARA, Calif. – Notes from the San Francisco 49ers' media session Wednesday:Coach Jim Harbaugh said tight end Vernon Davis is day-to-day with a hamstring injury he suffered late in the loss at Seattle on Sunday. Davis tweeted that physicians instructed him to rest this week, but he expects to play Sunday against the Colts and his younger brother, cornerback Vontae Davis. It will be the first time the brothers face each other since Vontae Davis entered the NFL in 2009.