Packers WR Randall Cobb out at Arizona with injured chest

GLENDALE, Ariz. -- Already short on receivers, the Green Bay Packers were down to three for the rest of Saturday's 26-20 playoff loss to Arizona after losing Randall Cobb to a chest injury in the first quarter.

Cobb stayed at a hospital in Phoenix overnight for observation. He tweeted Sunday that he had been discharged, saying he was "feeling much better."

His injury happened on a play that did not count.

Cobb caught a 49-yard pass that was wiped out by an illegal shift penalty on right tackle Bryan Bulaga. It would have given the Packers a first down at the Cardinals' 3-yard line.

The Packers finished that drive, which resulted in a field goal, with James Jones, Jared Abbrederis and Jeff Janis as their only three available receivers -- none was in their top-four receivers at the start of the preseason.

It was a risk to take only four receivers into the game, but the Packers decided not to add one to their roster after Davante Adams suffered a sprained MCL in his right knee in last weekend's wild-card win over the Redskins.

The Packers were short at the receiver position to begin the season with Jordy Nelson (knee) and Ty Montgomery (ankle) on injured reserve.