The San Francisco 49ers are making a change on their coaching staff as they try to address their defensive struggles. Defensive coordinator Steve Wilks will move from the coach's booth upstairs to the field level to call Sunday's game against the Jacksonville Jaguars. The move comes after the Niners' three-game losing streak in which their defense has dropped from one of the best in the league to one of the worst.

• The San Francisco 49ers are making a coaching change on their defensive staff.
• Defensive coordinator Steve Wilks will move from the coach's booth to the field level.
• The move comes after the Niners' three-game losing streak and defensive struggles.
• Wilks will directly communicate the call to linebacker Fred Warner.
• The Niners' defense has dropped from one of the best in the league to one of the worst in recent weeks.