Rapoport also reports that a motivating factor behind the Cardinals' apparent decision to part ways with Kolb sooner than later is a $2 million roster bonus owed on Sunday, March 17, to the seven-year veteran out of Houston.
Kolb's future in Arizona first began to appear murky after the Cardinals agreed to a three-year deal with quarterback Drew Stanton on Wednesday. Stanton, as Gregg Rosenthal at NFL.com notes, is familiar with new head coach Bruce Arians' offensive system after spending the 2012 season as Andrew Luck's backup with the Indianapolis Colts.
In 2012, appearing in six games due to a combination of depth chart changes and injuries, Kolb threw for 1,169 yards -- completing 59.6 percent of his throws -- with eight touchdowns and three interceptions.
So, if he's not a Cardinal in the near future, Kolb may not be a free agent for long, either.