Paolo Di Canio turned down the opportunity to manage Celtic in 2014, his former assistant has claimed.
The controversial Italian - who played for the Parkhead club in 1996 - was in the running to replace Neil Lennon in 2014 and he made himself available to the club's board.
Fabrizio Piccareta, Di Canio's number two at Sunderland and Swindon Town, insists Celtic made a "firm proposal" to the former West Ham United star.