Alexander had been injured entering training camp but had been up to speed for most of the last several weeks. He had run with the first-team at times while Bradley McDougald had been sidelined with a pectoral strain.
Additionally, he played significant snaps at weakside linebacker in Seattle’s preseason finale against the Oakland Raiders as it appeared he was getting a chance to serve as a backup at the spot with K.J. Wright likely to miss the season opener following knee surgery last week.
Instead, Alexander is not going to be a part of the team’s initial 53-man roster.