Doug Pederson announced Friday that a decision has not yet been made on whether running back Jay Ajayi will play Sunday against the Denver Broncos. Ajayi's game status will depend on how quickly he can pick up a handful of plays in the offense.

Since practicing with the team Wednesday, Ajayi has walked through a limited number of plays that could be called in varying game situations. The team is working on red zone plays in practice this afternoon.

"He's done a nice job. He's a smart guy. He comes from an offense that uses very similar terminology so he's familiar with that. He's picked it up," said Pederson. "He's had some extra meetings with (running backs coach Duce Staley) this week. We're trying to get him up to speed as fast as he can and we can."

On a different note, tight end Zach Ertz acquired tightness in his hamstring during Thursday's practice and was backed down. Ertz will participate in practice today, according to Pederson.

Cornerback Ronald Darby is doing well and had the best week of practice thus far since returning from his ankle injury, Pederson says. He's been in a backup role during practice, allowing him to work back into game conditioning. Darby will be listed as questionable heading into Sunday's game and will be a game-time decision.

Also of note, defensive tackle Justin Hamilton was resigned to the practice squad after being waived from the active roster. Hamilton has played in three games this season and recorded a half-sack against the Carolina Panthers in Week 6.