UCLA linebacker Anthony Barr visits doctor for undisclosed injury

UCLA senior linebacker Anthony Barr visited a doctor and did not practice Wednesday, less than 24 hours after suffering an undisclosed injury during a team drill.

The All-American’s injury is not believed to be serious, according to a person close to the football program who was not authorized to discuss the situation publicly.

A trainer took Barr’s helmet during practice Tuesday after he appeared to collide with an offensive lineman on a running play. Such a move by a trainer is standard protocol if a player exhibits symptoms of a concussion.

Coach Jim Mora declined to address Barr’s injury Wednesday.

Sophomores Aaron Wallace and Kenny Orjioke alternated in Barr’s spot at right-side linebacker. Wallace, expected to start at left-side linebacker, played the right side last season, so he’s familiar with the position.

Mora said he expected to shuffle multiple players through the linebacker spots even if everyone was available for the opener against Nevada on Aug. 31 at the Rose Bowl.

“It’s the nature of offenses now, with the 90 plays or 80 plays and the heat that we’ll be playing in early in the year, at least at the Rose Bowl, that we’ll rotate guys through and try to keep them fresh,” Mora said.

Expect mystery

The Bruins formally started their preparations for Nevada, though what they’ll see on game day remains something of a mystery.

Mora said he expected the Wolf Pack to run the pistol formation in addition to a spread offense that could feature run-and-shoot plays.

“It’s really hard for us to get a bead on exactly what they’re going to be,” Mora said, “because they’ve had some change [in coaching personnel] and they have some varied backgrounds.”

Wallace said Nevada’s offense might actually look somewhat familiar.

“They run a similar offense to ours, so some of the things we’ve already seen,” Wallace said. “As long as we follow our defensive rules, I think we’ll be all right if they do decide to switch it up.”

This is only a test

UCLA will simulate the game-day experience of a Saturday at the Rose Bowl to give its newcomers a test run of sorts.

Everything from the team’s pregame meal to the so-called Bruin Walk into the stadium will be duplicated, followed by a mock game.

“What you find that first time you walk into the Rose Bowl is that your adrenaline takes over, and you saw it in the spring game, where they get tired real easy,” Mora said. “So we’re going to try to create that on Saturday night so that when we come out against Nevada we’re a tad more relaxed and used to the environment.”

O captains my captains

Players elected six captains: Barr, quarterback Brett Hundley, center Jake Brendel, guard Xavier Su’a-Filo and linebackers Eric Kendricks and Ryan Hofmeister. Mora said the team would also pick a special-teams captain each week.

ben.bolch@latimes.com

Twitter: @latbbolch

Staff writer Chris Foster contributed to this report.