With all the uncertainty surrounding Michael Vick, movement on the Falcons’ depth chart at quarterback isn’t surprising. This time, it’s at the bottom.

Based on his erratic play in Atlanta’s preseason opener last week, D.J. Shockley has dropped to third. Shockley is trying to beat out Chris Redman for the No. 2 job behind starter Joey Harrington, but he had a mediocre debut against the New York Jets.

“I think mostly he just wasn’t in a comfort zone, was off-balance a couple of times and moved in the pocket,” Falcons coach Bobby Petrino said Tuesday. “But he settled down. He’s had some good practices here in the last couple of days, so hopefully it’ll be a different story.”

Shockley, a 2006 seventh-round draft pick from Georgia, took no snaps as a rookie behind Vick and Matt Schaub, but he hoped to impress a new coaching staff when the Falcons began training camp three weeks ago.

Instead, with Harrington entrenched as the starter and Vick out of the picture because of federal dogfighting charges in Virginia, Redman distinguished himself by performing better than Shockley in practice. Redman also benefited from knowing Petrino’s playbook after they spent the 1998 season together at Louisville.

“He’s got a reason for why he calls every play, and he knows as much as any coach in the NFL,” said Redman, a third-round draft pick for Baltimore in 2000. “He’s very knowledgeable. He’s just got a knack for calling plays, and he’s really good at it. I’ve never been around a better coordinator my entire career.”

Raiders

Coach Lane Kiffin had more tests and missed another practice while recovering from a viral infection.

Kiffin has been in the hospital since Monday morning for tests and observation. He is expected to return in time to coach Saturday’s exhibition game against the San Francisco 49ers.

Kiffin, 32, is the youngest coach in the NFL, making his health problems even more of a surprise to his players. Quarterback Andrew Walter said his coach would “have to be pretty sick not to be out here,” and the team would try to go on like nothing had changed.

Vikings

Jason Glenn gave it everything he had trying to get ready for a seventh NFL season. His aching knees just wouldn’t let it happen.

The Minnesota Vikings linebacker and special teams standout, one of the most liked players on the team, officially retired Tuesday.

Glenn appeared in nine games with the Vikings last season, spent the first five years of his career with the New York Jets and also played one season in Miami.

Titans

Rookie defensive end Jacob Ford could have surgery as soon as Wednesday to repair a torn left Achilles’ tendon.

Ford was the Titans’ sixth-round draft pick out of Central Arkansas. He was working in an individual drill Monday when he went down. He tried to hop off, but then was carted off the field.

Ford is the second rookie defensive lineman the Titans drafted to have a season-ending injury. Tackle Antonio Johnson tore up his knee and already is on injured reserve.

The Titans picked up defensive end Jason Hall off waivers from Carolina. The 6-foot-2, 253-pound Hall originally signed as an undrafted free agent with Buffalo in 2006, was cut and signed with Carolina in January.

Bills

John McCargo hurt his left ankle and was unable to complete practice Tuesday.

Coach Dick Jauron said the backup defensive tackle was fine, but would have more tests. McCargo called the injury “nothing serious,” saying he was hurt when he fell back on his ankle during an 11-on-11 drill. He limped off and was immediately attended to by trainers and a team doctor.

Jaguars

Offensive lineman Stockar McDougle ruptured his left Achilles’ tendon and will be out for the season, the team’s second significant injury along the offensive line.

Jacksonville already was playing without starting center Brad Meester, who broke his right ankle two weeks ago and will miss at least the first three games of the regular season.