He has missed four of his last seven tries from 40 to 49 yards and eight of his last 21 overall. He ranks 29th in field-goal percentage at 70.4 after setting a single-season NFL record last season with 44 made field goals.
‘‘David Akers is working through something and we want to make sure we have a Plan B,’’ Harbaugh said.
NOTES: Walker didn’t practice but said he expects to play against the Rams after bruising a hip and his ribs Sunday in the Superdome. ... In addressing the season-ending injuries of WR and return man Kyle Williams (knee) and RB Kendall Hunter (ankle), Harbaugh said, ‘‘The sad thing for all of us is two known friends and trusted agents, Kyle Williams and Kendall Hunter, are going to be out for the season.’’ ... Also on Wednesday’s practice report: LB Aldon Smith (shoulder) and S Darcel McBath (concussion).
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