Tight end Delanie Walker could miss the playoffs because of a jaw injury, coach Jim Harbaugh said Monday.
Harbaugh said the team would delay a roster decision until next week.
The 49ers still need a win Sunday, or a loss by New Orleans, to clinch a first-round bye in the playoffs.
"If there's a shot that he's going to be back in the postseason, we'd rather not make a roster move with him," Harbaugh said. "It'd be our hope that if he can be back, he will be back. And leave that option available."
The 49ers will be watching to see how Walker heals from an injury that floored him in the first quarter of Saturday's 19-17 win at Seattle. Walker's helmet was inadvertently kicked off by Seahawks linebacker Leroy Hill, and Walker had to be carted off the field, holding a towel to his mouth.
Walker hasn't caught a pass in the past six games, but he has been a valuable blocker, especially in the two-tight-end packages. He caught the go-ahead touchdown in the final minutes at Detroit on Oct. 16.
Justin Peelle replaced Walker for the remainder of Saturday's game. Starter Vernon Davis is the only other tight end on the 49ers' roster, although Stanford product Konrad Reuland is a candidate to be promoted off their practice squad.
Ginn did not play Saturday because of a left-ankle injury from a Dec. 19 win over Pittsburgh. "I'm not trying to really rush it," said Ginn, adding that he isn't intentionally saving himself for the playoffs and instead leaving the decision to play up to the trainers.
Williams suffered an apparent concussion while returning a fourth-quarter kickoff. Former 49er Michael Robinson drew an unnecessary roughness penalty for a helmet-to-helmet hit on Williams, who had slipped earlier on the play. Harbaugh didn't think it was a clean hit, noting: "Kyle had given himself up. He should have been tagged off."
Harbaugh has said the 49ers plan on re-signing Morgan, a pending free agent. Morgan said he hasn't heard from his agents regarding any new contract, though he does want to return: "What better place to be than here," Morgan said.