The former Arsenal man, who is rumoured to have been recommended to Roeder by Gunners boss Arsene Wenger, was originally the target for a permanent transfer but will instead leave parent club Fiorentina for a second loan spell in two seasons.
Prior to joining the Viola, when he rejected a new contract at the Emirates Stadium, Lupoli had a loan spell at Championship side Derby County which ended in their promotion to the Premier League via the Play-Offs.
"I am very happy to be here and hope to contribute for a great season for Norwich City and to be successful," Lupoli told the Canaries World. "I spoke to the manager and I really feel that he wants me here.
And it was not just Wenger who played a part in the move. David Bentley, currently agitating for a move from Blackburn with Tottenham Hotspur the most likely destination for the England winger, has also had an influence.
"I know a lot about Norwich City - I was with Arsenal when they and my team-mate David Bentley were in the Premier League and have followed their progress."