The midfielder joins Boro on loan for a month and sxpeaking to the CT, the Nuneaton Chairman said: "I would like to extend our thanks to Chairman Ray Ranson and manager Chris Coleman for their assistance in allowing Adam to join us.
"Kevin Wilkin is delighted to have Adam on board."
Walker who made his City debut last season and a player whose progression has been held back by the lack of a reserve team, can play for Nuneaton in the FA Trophy and Birmingham Senior Cup but not the FA Cup as City do not want him cup tied.