Buffalo Bills WR Kolby Listenbee (hernia) has been explosive when on the field but needs to be healthy, head coach Rex Ryan said.

Houston Texans WR Cecil Shorts is likely to open the year as the starting slot receiver, in the opinion of beat writer Tania Ganguli.

Buffalo Bills WR Greg Salas is being looked at as a potential punt returner in addition to competing for the No. 3 receiver job, head coach Rex Ryan said.

Free-agent QB Michael Vick (Steelers) said Thursday, July 21, he remains optimistic about playing in 2016 and wants to be able to make a contribution to a contender.

Dallas Cowboys RB Darren McFadden (elbow) will have a scan on his broken elbow Monday, July 25, and he said hopes to return during the preseason.

Minnesota Vikings WR Charles Johnson is likely competing with WR Moritz Boehringer for a spot on the roster, according to beat writer Matt Vensel, who also mentioned that Johnson had a strong spring while working mainly with the first-team offense.

Footballguys View: Johnson created a ton of buzz last offseason, but was banged up and never followed through in the regular season. Boehringer has a ton of size/speed upside, but he has only played as high as semi-pro ball in Germany and is more likely a practice squad candidate.

Carolina Panthers DT Kawann Short is expected to have contract extension talks with the Panthers during training camp, according to sources.

Carolina Panthers CB Robert McClain could receive some snaps at safety during training camp so he can improve his versatility. McClain is expected to be on the roster bubble during camp.

Carolina Panthers WRs Corey Brown, Stephen Hill, Brenton Bersin, Kevin Norwood and Damiere Byrd will compete for two roster spots during training camp.

San Francisco 49ers LB Michael Wilhoite probably will enter training camp as the leading candidate for one of the inside linebacker jobs but will have to compete with LBs Gerald Hodges and Ray Ray Armstrong for the job. All three players could receive playing time during the season depending on the opponent.

Footballguys View: The 49ers have competition for starting spots all over their roster, which isn’t a great sign on a roster bereft of proven talent. The defense has plummeted since being comparable to the Seahawks a few short years ago.