PITTSBURGH — Pitt coach Dave Wannstedt won't announce until gametime whether freshman Pat Bostick, the starter most of the season, or Seneca Valley graduate Kevan Smith will open at quarterback Saturday against South Florida.

An ineffective Bostick was benched during a 20-16 loss to Rutgers last Saturday, but returned to throw an interception into the end zone during the final minute. Bostick was replaced earlier in the game by redshirt freshman Kevan Smith, but Smith injured his right shoulder.

Smith did not separate his shoulder, as Pitt initially thought, and could play Saturday against South Florida (8-3, 3-3 Big East) if he outperforms Bostick during practice.

"We'll practice both and rotate both," Wannstedt said Monday. "We'll see how Kevan is, how Pat bounces back and make a determination come Saturday."

Bill Stull began the season as Pitt's quarterback, but injured a thumb in the Sept. 1 opener against Eastern Michigan and hasn't played again. Smith started the next two games but was replaced by Bostick midway through a Sept. 22 loss to Connecticut, and Bostick had played since.

Bostick, a star at Manheim Township High in Lancaster, Pa., a season ago, is 121-of-196 for 1,135 yards, six touchdowns and eight interceptions for Pitt (4-6, 2-3). Smith is 36-of-64 for 415 yards, one touchdown and four interceptions.