Governor Pat Quinn has until Tuesday to act on the measure that would add five casinos in Illinois, including one for Rockford. The city of Chicago would also get a casino.
Quinn says he'll set aside some time this weekend to review the legislation line-line-by line, and decide what sort of action he will take.
The governor could veto the measure, make changes, or sign it. If he takes no action, the bill automatically becomes law.
Quinn has previously voiced concerns about the bill, saying it lacks oversight.
In addition to the new casinos, the bill would allow for slot machines at horse racing tracks. That was a chief concern for the governor when lawmakers approved a similar measure last year.