Nelson (ribs) will not practice Friday due to an illness, but the ailment is not expected to threaten his availability for Sunday's NFC championship game against the Falcons, Rob Demovsky of ESPN.com reports.
Silfverberg is dealing with an upper-body ailment that will keep him from traveling on a two-game road trip that begins in Minnesota on Saturday, and culminates with a clash against the Jets on Monday.
Mickelson (groin) confirmed Wednesday that he will play in the week's CareerBuilder Challenge, Golfweek reports. "I feel good and I want to play," said Mickelson. "I don't know where my game is, but I figure the only way to find out is to play."