Blazers guard Elliot Williams tore his Achilles on Tuesday. (Getty Images)

PORTLAND -- The hits keep coming for Portland Trail Blazers guard Elliot Williams, who may have just suffered his third season-ending injury before his third NBA season even started.

The Blazers have announced that Williams, a reserve guard, suffered a torn left Achilles tendon while participating during a "voluntary offseason workout" at the team's practice facility on Tuesday. The team said that Wiliams will undergo surgery but did not place a timeline on his recovery. Achilles tears generally require nearly a full calendar year for rehabilitation.

Williams, 23, was unable to play during 2010-11, his rookie season, after undergoing surgery on both of his knees. He also missed significant time in 2011-12 after undergoing left shoulder surgery following an injury sustained during practice.

"A year ago, at this time, I couldn't even walk," Williams said in February 2012, reflecting on his knee surgeries. "I was in the bed. It was tough. I had surgery on both my knees. I worked hard to get back on the court. It's a blessing." 

On Monday, Blazers coach Terry Stotts told Blazers.com that a vast majority of his young team was in town more than three weeks before the start of training camp thanks to All-Star forward LaMarcus Aldridge, who decided to organize the workouts.

"With so many new players, they're getting to know each other, they are lifting weights, they are doing conditioning drills and then they are playing," Stotts said. "As much as we can do with them, within a group, is limited. But it's all been very positive."

Portland, in the midst of a full-scale rebuilding effort, figured to rely heavily on Williams this season. Wesley Matthews was the surefire starter but Williams, a smooth left-handed scoring guard, seemed the best candidate for reserve minutes. In his absence, 2012 second-round pick Will Barton and 2011 first-round pick Nolan Smith will pick up the playing time slack.

Williams, a 2010 first-round pick out of Memphis, holds career averages of 3.7 points and 0.8 rebounds in 6.2 minutes per game in just 24 career appearances. He's still on his rookie scale contract, a deal that will pay him $1.4 million in 2012-13. The Blazers hold a team option for 2013-14.