The 24-year old is has been at the Racecourse before after spending a season on loan with the north Wales side in 2000/01.
With the Dragons losing Craig Morgan, Juan Ugarte and Chris Llewellyn within 24 hours, the news of Roache's arrival will give some added hope to the fans of the troubled League Two club.
Roache joined Burnley from United in 2003, playing 54 league games for the Championship club, scoring just one goal.