The 49′ers re-signed linebacker Hannibal Navies and waived fullback Zak Keasey yesterday. Navies signed with San Francisco last season after linebacker Manny Lawson’s season was cut short by a foot injury. During his time with the 49ers, Navies registered nine tackles, one sack and a force fumble. Keasey, who was promoted from the practice squad on September 21st, appeared in three games this season. The 49ers play host to the New Orleans Saints this Sunday afternoon.