Henderson joined Chris Martin, Michael Spillane and Paul McVeigh at Kenilworth Road in a Carrow Road Old Boys Reunion.
Martin and Spillane were on loan, and have since returned to try to push themselves forward in Bryan Gunn's plans. McVeigh is now training with the Canaries having finished his pay-as-you-play deal with Mick Harford's side. Both sides harbour hopes of a successful trial.
Henderson, still only 24, arrived at the Hatters via Northampton. He featured strongly in City's promotion campaign in 2003-2004 but was later farmed out on loan to Rotherham. He can play as a winger or up front. Could he be in line for a return?