SANTA CLARA San Francisco coach Jim Harbaugh said Friday that wide receiver Mario Manningham, who is coming back from an ACL injury suffered in December, "looked really good" during Thursday's practice.
Asked about the timetable for Manningham's return to the active roster, Harbaugh said he didn't have a "crystal ball" but that "it's going to be soon."
"He had a very good day (Thursday)," Harbaugh said.
Aside from Anquan Boldin, the 49ers have received little production from their wide-receiving corps entering Sunday's game at Tennessee. Manningham, who signed a two-year contract with the team last season, served as a third-down receiver until he was injured but finished second on the team to Michael Crabtree with 42 receptions.
The 49ers have an open roster spot after releasing wide receiver Chris Harper on Thursday. Harbaugh said the team would add someone to the 53-man roster today but would not identify him. It's likely that one of two rookies, defensive linemen Mike Purcell or Quinton Dial, will be elevated to the active roster.
Nose tackle Glenn Dorsey practiced on a limited basis Friday but is listed as questionable on the injury report.
"Did good," Harbaugh said of Dorsey.
But will he play against the Titans on Sunday?
"We'll make that determination (closer to Sunday)," Harbaugh said.
Notes Ahmad Brooks, who's dealing with a family situation in Virginia, has missed the team's past two practices. He'll join the 49ers in Nashville, Tenn., before Sunday's game.
Guard Alex Boone was fined $7,875 for striking Cardinals defensive lineman Alameda Ta'amu, who in turn was fined $10,000 for kicking Boone in the fourth quarter of last Sunday's game. Cardinals safety Tyrann Mathieu was fined $7,875 for grabbing running back Kendall Hunter and unnecessarily throwing him to the ground after Hunter scored a touchdown. Boldin, who came to Hunter's defense and was penalized, was not fined.
Right tackle Anthony Davis was fined $15,750 for clipping a Cardinals defensive lineman. Davis was penalized at the time.
Like Dorsey, wide receiver Jon Baldwin (illness), defensive tackles Ray McDonald (biceps) and Justin Smith (shoulder), and cornerback Carlos Rogers (knee) are listed as questionable. They are expected to play against the Titans. Dorsey is the only 49er who is truly questionable for Sunday's game.
Read Matthew Barrows' blogs at www.sacbee.com/sf49ers and listen for his reports Tuesdays on ESPN Radio 1320.