Blue chip junior middleweight prospect Demetrius Andrade, due to headline his first "ShoBox: The New Generation" card on Showtime on July 13, was forced to withdraw from the bout this week because of a sore left knee.

"He has a sore knee, some inflammation, nothing serious, but he needs two or three weeks of not doing anything on it," co-promoter Joe DeGuardia of Star Boxing told ESPN.com.

With the 2008 U.S. Olympian and former world amateur champion out, Showtime canceled the card scheduled to take place at the Paramount in the Long Island town of Huntington, N.Y. An opponent for Andrade had not yet been signed.

DeGuardia said Andrade (17-0, 12 KOs) tried to get through the soreness by taking a couple of days off from training, but when he began running again this week, the problem persisted.

"He thought he'd be OK, but it happened again. It's not going away, so he needs some time off it," DeGuardia said.

DeGuardia said Andrade had an MRI on the knee and, "It was clean," DeGuardia said. "Everything structurally was fine. It's a nagging pain that he has to try to get behind him."

If the knee is OK, DeGuardia said Andrade would return in late August or early September.

Andrade, 24, of Providence, R.I., has fought most of his career on ESPN2's "Friday Night Fights," including his most significant win, a lopsided 10-round decision against former "Contender" reality series winner Grady Brewer last August. Andrade's most recent bout also was the main event of an ESPN2 telecast, a first-round knockout of Rudy Cisneros on May 5.