The Steelers signed Spaeth this offseason in hopes he would fill in for Heath Miller, who is on the physically unable to perform list with a knee injury. Spaeth was carted off the field Wednesday and was diagnosed Friday with a lisfranc sprain, a dislocation of a bone in the middle of the foot.
Without Miller and Spaeth, the only healthy tight end with any extensive NFL experience on the Steelers is David Paulson. A 2012 seventh-round pick, Paulson made seven catches for 51 yards in 16 games as a rookie.
The other tight ends on the roster are: Jamie McCoy, who has played in one NFL game (last season with the Steelers); Peter Tuitupou, an undrafted rookie out of San Jose State; and John Rabe, an undrafted rookie out of Minnesota.