Striker joins Suffolk side on loan.
The month-long loan move will be the second time that Nnamdi has joined the Suffolk side, after a similar loan spell last season.U's U21s striker Nnamdi Nwachuku is heading out on loan to Leiston.
Ball's side have made a solid start to the new season and currently sit sixth in the Ryman Premier League with eighteen points from ten games.
They play Harrow Borough away on Saturday.