Sherman said Rossley was scheduled to meet with a doctor today and was not sure if he will be available to direct the offense when the Packers travel to play the Lions in Detroit on Sunday.
Rossley, 58, has been offensive coordinator for the Packers since 2000, when Sherman was hired as head coach.
Rossley was with the late Mark Hatley prior to Hatley's death on July 27. Hatley suffered a heart-attack during the night at his home after golfing with Rossley and defensive coordinator Bob Slowik.
It is likely that Sherman will call the offense if Rossley is unable to attend Sunday's game against the Lions.