The Steelers are not counting on Emmanuel Sanders to play Sunday night after spending all week in Texas following his mother's death Tuesday.
Her funeral will be held Saturday.
Sanders has 18 receptions for 243 yards and 2 touchdowns.
"It's hard when you lose your mother at a very young age, to come back and play," Arians said.
"Even if he makes it back in time, this is something we're not expecting. Our prayers and hearts just go out to him and his family."