HOUSTON -- Houston Comets guard Cynthia Cooper will miss at least two weeks with a rotator cuff injury.

Cooper, the WNBA's oldest player at 40, injured her right shoulder Monday at practice and had an MRI. During halftime of the Comets' game against the Phoenix Mercury on Tuesday night, team doctor Bruce Moseley said the MRI revealed a small tear in her right rotator cuff tendon. Moseley said Cooper will be out for two weeks and then will be re-evaluated.

On Thursday, the Comets signed guard Itoro Umoh-Coleman to fill Cooper's roster spot.

"If she comes back and is fine, she should be ready to go,'' Moseley said of Cooper. "But if the injury worsens and she needs surgery, she could miss the rest of the season. Cynthia is hopeful that she will return this season.''

She was one of the best players in the league before her retirement two years ago. She won three scoring titles, two Most Valuable Player awards and played on four championship teams with the Comets.

Cooper joined the Comets prior to this season after a one-year retirement. Last season, she coached Phoenix to a 10-6 record before leaving to spend more time with her family. In four games this year, Cooper averaged 16 points a game, 2.5 rebounds and 5.5 assists. Umoh-Coleman, a Clemson product, was released in the preseason by Houston. She scored a total of seven points in a pair of preseason games.