Former IRON MAIDEN singer Paul Di'Anno's previously announced U.S. tour appears to be in jeopardy due to the fact that he has has yet to secure a proper working visa to be able to enter the country.In a posting on on his Facebook page, Paul writes: "Having waited several months for the U.S. visa to be organized by the booking agent/visa agency in the U.S., and still not got any confirmation, it seems highly unlikely the tour shall start as planned. This situation is entirely beyond our control. Hopefully any dates that can't be made can be rescheduled, but again, this is down to the booking agency to arrange. There shall be news in the coming days of the latest progress (if any) on here, as soon as it is received." Di'Anno completed his first North American tour in early 2010, 17 years after he was deported following a prison term for guns and drug offenses. On August 27, 2011, Di'Anno played his first show since serving time in a U.K. prison after he falsely collected U.K. government benefits by claiming he suffered nerve damage to his back that prevented him from working. Due to a number of health issues, including a knee problem which will require surgery soon, Di'Anno announced in July that he will stop touring next year. Michael Salenius, Di'Anno's Swedish booking manager and tour manager, told BLABBERMOUTH.NET that next year will be "a big, fantastic" last touring year for Paul, with a lot of solo shows, festival appearances and Di'Anno vs. Blaze Bayley concerts. You will also see various guest musicians joining Paul on stage. Di'Anno recorded two classic albums with IRON MAIDEN before being fired and replaced by Bruce Dickinson. He went on to front a number of other bands, including KILLERS and BATTLEZONE, and released several solo records.