Cardinals Coach Ken Whisenhunt said Monday that treatment would be decided after Boldin had an MRI on his foot. Whisenhunt said Boldin's return depended on "what kind of damage is involved with the original dislocation."
Arizona (6-6) remain two games behind the Seattle Seahawks (8-8), who won at Philadelphia Sunday.
Boldin's injury is further cripples the Cardinals' wide receiving corps. Larry Fitzgerald missed Sunday's game with a groin injury.
The two Pro Bowl wideouts lead Arizona in receiving, each having caught six touchdowns passes. Fitzgerald has 75 catches for 1,060 yards, and Boldin has 48 receptions for 552 yards. The No. 3 receiver, Bryant Johnson, has 38 catches for 432 yards and one TD.