The winger, 23, was one of Keane's first signings when he paid Manchester United £1.6million for him in August 2009.
But after just one goal in 18 games for the Tractor Boys he was jettisoned on a season-long loan to Charlton.
New Ipswich boss Paul Jewell, looking for inspiration, not only recalled him but gave him his first start in 14 months.
Martin said: "I never felt properly welcome and part of the team before.
"I never had the run of games I needed to get my confidence up and this is a fresh start."