Jacobs beat out Gilmore for a roster spot with an outstanding performance in training camp, even moving ahead of free-agent signee Ashley Lelie on the 49ers' depth chart. But Jacobs has just three catches for 40 yards and a touchdown this season, failing to make an impact with a passing game that has the fewest yards in the NFL.
Jacobs, acquired in a trade with Washington last season, never made more than 16 receptions in a season.
"Taylor has exceptional skills, but we were not getting the production we needed at that spot," coach Mike Nolan said.
Nolan then re-signed the 29-year-old Gilmore, who was released in San Francisco's final cuts. The fifth-year pro had only eight catches for 150 yards last season, and the 49ers signed Lelie with the intention of upgrading the position, but he hasn't made a catch in four games.
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"It was a tough decision to waive Bryan Gilmore at the final cut," Nolan said. "I said at that time that it was probably the most difficult decision I had to make in the two years being here, because he is everything you are looking for in terms of work ethic and commitment."
The 49ers also waived backup fullback Zak Keasey and re-signed offensive tackle Patrick Estes, another victim of the club's final cuts before the regular season. Estes, a converted tight end, will provide depth for San Francisco's struggling line.
STEELERS -- Safety Troy Polamalu (strained abdominal muscle) and nose tackle Casey Hampton (sprained ankle), forced out of the Arizona game with injuries, are expected to play Sunday against Seattle.
"All indications are that they will be fine," coach Mike Tomlin said Tuesday.
The Steelers aren't as certain about four-time Pro Bowl receiver Hines Ward, who missed only his fourth game in 10 seasons Sunday because of a sprained knee. He will begin the practice work week today listed as day to day.
"He had a good day of rehab," Tomlin said. "I spoke with him and he feels good. We will take it day to day and see where he is. We'll do what's smart in that area, but that decision will be determined later in the week."
BENGALS -- Cincinnati placed linebacker Lemar Marshall on injured reserve Tuesday, a day after he tore the Achilles' tendon in his left leg during a 34-13 loss to New England.
The Bengals replaced him by claiming linebacker Corey Mays off waivers from New England. The second-year player appeared in eight games for the Patriots last season, and was placed on waivers before Monday night's game.
Marshall's injury left the Bengals decimated at linebacker.
Middle linebackers Ahmad Brooks and Caleb Miller were inactive because of injuries, and linebacker Landon Johnson sustained an eye injury during the game.
GIANTS -- New York signed defensive end Dave Tollefson and placed fullback Robert Douglas on injured reserve. The move came two days after the Giants tied an NFL record with 12 sacks against Philadelphia quarterback Donovan McNabb.
JAGUARS -- Jacksonville left tackle Khalif Barnes drove through a yard, crashed into a tree and then left the accident scene last weekend, police said. Barnes, already on probation for a drunken driving charge, was cited for careless driving and leaving the scene of an accident. He also was charged with violating a provision of his probation that limited his driving to work purposes.
FALCONS -- Atlanta switched long snappers, releasing Boone Stutz and signing veteran Mike Schneck, who was a 2005 Pro Bowl pick with Buffalo.