Baltimore prepared for Cundiff's possible absence by brining in veteran kicker Shayne Graham on Wednesday.
Graham, 34, has been playing in the NFL since 2001 but kicked in only 11 games over the past two seasons, including two for the Miami Dolphins this year.
He spent seven of his 11 seasons in Cincinnati and is 212-for-247 on field goal attempts for the Bills, Panthers, Bengals, Giants, Patriots and Dolphins.
Cundiff has kicked in all 14 games for the Ravens this season.
Defensive end Cory Redding (ankle) was a limited participant in Friday's walk- through session after missing practice the previous two days and is listed as questionable.