Green had been at Peterborough since 1998 when City boss Keith Alexander tried to sign him before the start of the 2003/04 season . Peterborough turned down the offer but eventually the Imps boss managed to get his man after a loan deal for the striker was made permanent a few days later in September 2003 . Green agreed a contract with the club that will see him stay at Sincil Bank until the summer of 2006 . The striker had a four week loan spell at Boston United in December 2005 .