Senquez Golson's mystery shoulder injury affects Steelers' defensive backfield

Don’t be surprised if second-round cornerback Senquez Golson is out of the mix for a good while.

After Mike Tomlin updated the injuries of nearly a dozen players, he said “no update” when asked about Golson, who’s on the physically unable to perform list with a shoulder injury.

The mystery of his injury, coupled with the trade for Brandon Boykin, places serious questions about when Golson will be ready to make his debut. The Steelers could place Golson on the regular season PUP list, which would shelve him for the first six games.

When I asked Golson last week about his situation, he said he had no idea when he would return but considered the injury day-to-day.

Hopefully we'll get clarity on Golson's injury this week.

A few other loose ends from Sunday:

Dan McCullers, Cam Thomas and Stephon Tuitt are among the defensive linemen who got good push up front during Sunday's practice. McCullers has big-time potential if he can show consistency and the ability to get to the quarterback. It's obvious he can move a pile. After reserve center Reese Dismukes won a one-on-one drill over McCullers and the two slapped each other after the play, McCullers moved Dismukes with ease in the rematch, prompting defensive line coach John Mitchell to tell him if it takes a slap on the head to motivate McCullers, the team will keep doing it. ...

The offense went 4-of-7 in red-zone passing drill, with corner Antwon Blake giving up two touchdowns. New corner Brandon Boykin was involved in two snaps on that drill. Linebacker Sean Spence has shown improved coverage skills. He's knocked down a few passes in camp, including one in this drill. ...

Fourth-round rookie corner Doran Grant has shown flashes, which eases the loss of Golson. His instincts are good. He broke off a sideline route to sniff out an over-the-middle play that would have put him in a position for a big hit (hitting wasn't encouraged in this particular drill). He perfectly timed a lob corner breakup from Landry Jones in red-zone drill. ...

Cortez Allen had his second interception of camp off an errant pass from Jones, who negated three straight good days with a rocky one Sunday. Allen was floating in the zone when Jones threw it right to him. ...

I'll say this again: Don't be surprised if slot receiver Eli Rogers makes the team. He has Mike Tomlin's attention. He's the only true slot receiver on the 90-man roster (even Markus Wheaton, the favorite there, had to learn the position and started as an outside guy).