SANTA CLARA, Calif. -- The San Francisco 49ers remain optimistic they will get four players back to practice this week from injury lists.Receiver Mario Manningham, cornerback Eric Wright and rookie defensive linemen Tank Carradine and Quinton Dial are "anticipated" to practice this week, coach Jim Harbaugh said Monday. This reiterates what Harbaugh said last week about the group. The 49ers have a walk-through practice Tuesday and then have a full-fledged practice Wednesday, which would be the player's first real test.