The Portland Trail Blazers have extended a qualifying offer to center Greg Oden, it was announced today by the team. Portland has also extended a qualifying offer to guard Patrick Mills and exercised its third-year options on forward Luke Babbitt and guard Elliot Williams.

Both Oden and Mills become restricted free agents, ensuring that the Trail Blazers will have right of first refusal should another team try to sign them. The moves give Portland the right to match any contract offer they receive in the offseason.

“We’ve stood behind Greg Oden every day since he became a Trail Blazer and that continues with today’s announcement,” said Trail Blazers President Larry Miller . “Despite the setbacks he’s experienced, he continues to be resilient in working tirelessly on his rehabilitation. We’re all very encouraged with not only his progress, but with his commitment and determination to return to the basketball court.”

Oden, 23, is averaging 9.4 points, 7.3 rebounds and 1.43 blocked shots to go with a 57.7% (290-for-503) mark from the floor in four seasons with the Trail Blazers.

Mills, 22, has appeared in 74 games over two seasons in Portland, averaging 5.1 points, 0.7 rebounds and 1.5 assists.

A rookie last season, Babbitt, 22, notched averages of 1.5 points, 1.3 rebounds and 5.7 minutes in 24 games. Acquired by Portland in a draft day trade on June 24, 2010, he also averaged 20.1 points and 7.4 rebounds in 14 games with the NBA D-League’s Idaho Stampede.

Williams, 22, missed his rookie 2010-11 season due to surgeries on both knees. Portland selected him with the 22nd overall pick in the first round of the 2010 NBA Draft out of Memphis.