Another hit to Bengals receivers

The Bengals could be down a second wide receiver Sunday when they play the San Francisco 49ers.

During the same week in which Cincinnati placed slot receiver Jordan Shipley (knee) on injured reserve, the availability of starting wide receiver Jerome Simpson is unknown after he was excused from practice Thursday. Simpson was detained Tuesday along with backup offensive tackle Anthony Collins after 2.5 pounds of marijuana arrived at Simpson’s home and another six pounds of marijuana were found in the residence.

If Simpson is held out Sunday, Andre Caldwell would leap from the No. 4 receiver to a starting role in a matter of days. The Bengals' No. 3 receiver would either be Brandon Tate or rookie sixth-round draft pick Ryan Whalen, who happened to play under 49ers coach Jim Harbaugh at Stanford last year.

Bengals coach Marvin Lewis addressed the investigation on SiriusXM Radio on Thursday. “I’ve been appraised of the situation for a few days now and unfortunately Anthony’s name got put into it for no reason," Lewis said via The Cincinnati Enquirer. "It was at Jerome’s house and it’s an investigation that’s going on. He’s cooperating and doing what he can to help in the investigation.”