NEW YORK (AP) _ Patrick Ewing's torn Achilles' tendon is completely healed but the New York Knicks are unsure when their star center will be able to return to the court.

To make matters worse for the team, backup center Chris Dudley sprained ligaments in his right knee playing basketball Tuesday. He will begin rehabilitating the knee immediately and can begin running again in four to six weeks, a Knicks spokeswoman, Lori Hamamoto, said Wednesday.

It is unclear whether Ewing or Dudley will be ready for training camp, which begins Oct. 5.

Ewing was sidelined with a partially torn Achilles' tendon from Game 2 of the Eastern Conference finals through the Knicks' run to the NBA Finals.

The 37-year-old center missed several games during the regular season and was hampered during New York's first 11 playoff games by Achilles' tendinitis.

He would have risked a career-ending torn Achilles' tendon if he continued to play throughout the playoffs.