Coach John Harbaugh made what we learned yesterday official before the start of practice this afternoon: Edgar Jones will switch from linebacker to tight end.

Jones, who played tight end and defensive end at Rayville High in Louisiana, was used sparingly as a tight end during organized team activities, but Harbaugh said the coaching staff wanted to revive the experiment.

"Yeah, it's alive and well," Harbaugh said. "We want to give him a week or two in there and see how he does. He's played well at linebacker. He knows the linebacker position. We feel like we can move him back [to linebacker] at any time, and he'll be just fine for us. ... But we want to see if he can help us at tight end."

Look for more on the Jones switch in tomorrow's paper. Here are observations from today's practice:

* Defensive end Trevor Pryce and defensive tackle Lorenzo Williams returned to the field. Pryce was not present during the portion of yesterday's practice open to the media, and Williams was absent from practice yesterday and Monday.

* Cornerback Derrick Martin (right shoulder) watched practice from the sideline.

* Right guard Marshal Yanda joined Jason Brown and Chris Chester in snapping the football to the quarterbacks. Is another switch in the works?