The San Francisco 49ers are preparing for their Week 16 contest against the Chicago Bears on Sunday at Levi's Stadium in Santa Clara, California.

Head coach Kyle Shanahan revealed to reporters on Friday that safety Jaquiski Tartt is headed to injured reserve. The move will become official on Saturday because the 49ers missed Friday's deadline. Tartt is the only player ruled out for Sunday and the only player on the team's official injury report for the upcoming game.

Tartt has been dealing with a shoulder injury (stinger) and was inactive the last two games. Rookie Marcell Harris gets the nod to start at strong safety. It also gives the 49ers the option to move rookie D.J. Reed back to free safety, Shanahan said.

Below are the official injury reports for the 49ers and Bears. Also included are Friday's practice participation reports, which were provided by the 49ers Communications staff.

San Francisco 49ers


Out
S Jaquiski Tartt (shoulder)

Chicago Bears


Doubtful
S Eddie Jackson (ankle), LB Aaron Lynch (elbow)

Questionable
DT Bilal Nichols (knee)

San Francisco 49ers Friday Practice


Did Not Participate In Practice
S Jaquiski Tartt (shoulder)

Limited Participation in Practice
RB Matt Breida (ankle), LB Mark Nzeocha (groin), LB Malcolm Smith (achilles)

Full Participation in Practice
S Antone Exum (hip), C Weston Richburg (knee), T Joe Staley (not injury related), CB K'Waun Williams (knee)

Chicago Bears Friday Practice


Did Not Participate In Practice
S Eddie Jackson (ankle), LB Aaron Lynch (elbow)

Limited Participation in Practice
DT Bilal Nichols (knee)

Full Participation in Practice
DT Akiem Hicks (illness)