Prater (hip/illness) didn't practice Friday and is listed as questionable for Sunday's game against the Rams, Darren Urban of the Cardinals' official site reports.
Prater missed Weeks 5 through 7 with the hip injury and has been limited in practice ever since, but his absence Friday seems to be on account of the ailment, which is ill-timed at the end of the week. If the Cardinals are truly concerned about Prater's availability for Sunday, they'll need to sign another kicker Friday or Saturday.