Sources: Greg Whittington injured

Georgetown's Greg Whittington suffered a significant knee injury that could force him to miss the entire 2013-14 season, sources told ESPN.com.

The 6-foot-8 sophomore forward suffered the injury a little more than a week ago. The extent of the injury, as well as how much time he will miss, is still undetermined, sources said.

"They still aren't completely sure," one source said. "He could still come back. They are going to have it looked at again soon."

Whittington averaged 12.1 points and seven rebounds last season before being ruled academically ineligible prior to the St. John's game on Jan. 12. He played 13 games this past season and was expected to help ease the loss of Big East Player of the Year Otto Porter, who left early for the NBA.

Georgetown coach John Thompson III told CSNWashington last month that Whittington would return to the team after missing the final 19 games of the season.

The Hoyas finished 25-7 last season and lost to Florida Gulf Coast in the NCAA tournament's round of 64. Thompson returns starters Markel Starks, Nate Lubick and D'Vauntes Smith-Rivera and will also add UCLA transfer Josh Smith after the first semester.

Georgetown will open the season against Oregon in the Armed Forces Classic on Nov. 8 on ESPN at an Army base to be announced. The Hoyas will play in the new Big East with six other former Big East schools, as well as newcomers Butler, Creighton and Xavier in the 10-team league that will debut next season.

Jeff Goodman covers college basketball for ESPN.com.