Clarets defender O’Neill returns to Southend
The 24-year-old make one appearance for Phil Brown’s side on loan in January 2014, after suffering a thigh injury on his debut against Chesterfield.
But he has moved back to Roots Hall, after further loan spells with Scunthorpe United and Leyton Orient.
O’Neill, signed by Eddie Howe from Mansfield Town three years ago, made has just two appearances for the Clarets.
O’Neill is pictured behind Lukas Jutkiewicz in pre-season training.