Martin spent last season on loan at Luton Town in League Two, but the 20-year-old, who burst into the Canaries team with five goals in nine games in 2007, has learnt from the experience according to Gunn.
Hertha Berlin 30-year-old Jaroslav Drobny, who has two caps, spent time with Fulham and Ipswich Town without making a competitive first-team appearance before heading for the German Bundesliga club.