Neither player practiced this week.
Marshall has been hobbled since he sprained his right ankle in the season opener. He left in the second quarter Monday night game against the New York Jets but returned in the second half, finishing with just one reception for 6 yards.
Allen has been ill all week.
The Bears also ruled out defensive tackle Jeremiah Ratliff (concussion), center Roberto Garza (ankle), left guard Matt Slauson (ankle), linebacker Shea McClellin (hand) and cornerback Sherrick McManis (quadriceps). Safety Chris Conte (shoulder) is questionable.