Florida State quarterback Jameis Winston has undergone specific testing to determine why he is showing weakness in his throwing shoulder that was discovered during the NFL combine medical exams, according to team and league sources.

Sources said Winston had electromyography to study a weakness in his shoulder that often can be caused by a nerve problem and can be treated through therapy, if necessary.

No other specifics were provided by the sources. Winston is scheduled to speak to the media Friday afternoon after his planned session Thursday was postponed for medical testing at a nearby hospital, a source said.