Update: Blazers F LaMarcus Aldridge (Quad Injury) Sat Out Thursday Morning Training Camp Session

Joe Freeman of The Oregonian reported on Twitter Thursday that Portland Trail Blazers All-Star forward LaMarcus Aldridge did not participate in the team's Thursday morning training camp session because of a strained left hip flexor.

Blazers just opened practice and LA was riding exercise bike and not dressed in practice uniform.

LaMarcus Aldridge missed Blazers practice with a left hip flexor strain.

Blazers coach Terry Stotts said Aldridge's hip injury is not serious, but it sounds like he will miss significant time. Return unknown.

Chris Haynes of CSNNW.com reports on Twitter that three Blazers -- Aldridge and guards Mo Williams and Will Barton -- were sidelined during Thursday's action.

Mo Williams (right ankle sprain) did not practice for third consecutive session. LaMarcus Aldridge sat out too.

LaMarcus Aldridge (left hip flexor strain), Will Barton (concussion).

Stotts says LaMarcus Aldridge will be out a few days. Calls it disappointing.

Casey Holdahl of Blazers.com reports on Twitter...

Stotts says its too early to say if LaMarcus Aldridge will be available for Fan Fest [on Sunday]

Update: Aldridge wrote on Twitter Thursday that he suffered an injury to his left quad rather than to his hip, and he downplayed its severity.

I'm ok just suffered a left quad strain. I should be back on the court pretty quick.

The Blazers' communication staff also confirmed the new, updated diagnosis on Twitter.

Injury clarification: Portland F LaMarcus Aldridge has a left quad strain.

Aldridge, 28, appeared in 74 games last season, averaging 21.1 points and 9.1 rebounds.

Barton, 22, will be subject to the NBA's concussion protocol, which was instituted prior to the 2011-12 season. Any player deemed to have suffered a concussion must pass a series of tests and receive clearance from the NBA's concussion program director, Dr. Jeffrey Kutcher, before returning to action.

The Blazers open their preseason schedule against the Los Angeles Clippers at the "Moda Center" on Monday.

-- Ben Golliver | benjamin.golliver@gmail.com | Twitter