In a statement, the NFL said Neal will be eligible to return to the Packers' active roster on the day after the team's fourth regular-season game. Neal is eligible to participate in all offseason and preseason practices and games.
Neal's agent did not immediately answer a request for comment. Neal's Twitter account appeared to have been deleted.
Citing the "confidentiality of the process," a Packers spokesman said team officials would not comment on the situation.
Neal, a second-round pick out of Purdue in the 2010 NFL draft, has played in nine regular-season games and one playoff game over two seasons because of injuries. He has seven tackles, a sack and a forced fumble in those games.
Neal missed the first three games with an abdominal injury as a rookie in 2010, made his NFL debut in Week 4, then injured his right shoulder and was placed on injured reserve Oct. 26.