Cleveland ? Browns tight end Kellen Winslow Jr. tore the anterior cruciate ligament in his right knee when he crashed his motorcycle, two sources within the league told the Associated Press on Thursday, placing his 2005 season in doubt.

An injury such as Winslow’s typically requires 10 to 12 months of rehabilitation.

Winslow, who wrecked his high-powered bike while riding in a parking lot May 1, will get a second medical opinion before surgery is scheduled, said the sources, who have knowledge of his injuries and spoke on the condition of anonymity.

Although the Browns have Winslow’s medical test results, the club cannot disclose the nature of his injuries because they have not received permission from Winslow or his family.