Speaking after Sunday's loss to the Chiefs, coach Mike Shanahan refused to name a starting quarterback for Week 15 against the Falcons.
Wes Welker (concussion) will undergo baseline testing Monday.
Andre Roberts caught one pass for eight yards in Week 14 versus St. Louis.
Michael Floyd caught two passes for 26 yards in Week 14 against the Rams.
Chris Givens caught one pass for 21 yards in Week 14 against Arizona.
Rob Housler caught three passes for 42 yards in Week 14 against the Rams.
Stedman Bailey caught three passes for 46 yards in Week 14 at Arizona.
Kenny Britt was a healthy scratch in Sunday's Week 14 loss at Denver.
Rashard Mendenhall rushed for 41 yards and one touchdown on 17 carries in Week 14 against the Rams.
Danny Amendola caught four passes for 36 yards and one touchdown in Week 14 against the Browns.
Josh Boyce caught three passes for 49 yards in Week 14 against the Browns.
Lions RE Ziggy Ansah sustained a shoulder injury during Sunday's Week 14 loss at Philadelphia.
Kellen Clemens completed 16-of-27 passes for 181 yards and two interceptions in the Rams' Week 14 loss to the Cardinals.
Andre Ellington rushed for 46 yards and one touchdown on 11 carries in Week 14 against the Rams.
Greg Little caught two passes for 14 yards in Week 14 against New England.