What happened: The Patriots opened training camp reporting day Friday, with coach Mike Vrabel set to address media at 11:30 a.m. and Hunter Henry, Marcus Jones and Robert Spillane speaking at 11:45 a.m. Second-round outside linebacker Gabe Jacas remains unsigned as veterans reported, a day after quarterbacks and rookies arrived Tuesday.

Why it matters: OLB Harold Landry III and tight end C.J. Dippre begin camp on the physically-unable-to-perform list, while running back Terrell Jennings starts on the non-football injury list, thinning New England's numbers at the outset of practice. Jacas' unsigned status leaves the Patriots without their top defensive draft pick on the field as padded work approaches.

What to watch: Vrabel, Henry, Jones and Spillane address reporters Friday; watch for a Jacas signing and PUP/NFI activity as camp progresses.