Centre-back Ekanem is no stranger to United Park having played for the Boynesiders in 2011, lining out 16 times.
The former Shamrock Rovers and Longford man then joined Leinster Senior League side Phoenix FC before returning to League of Ireland football with Cabinteely in 2015.
The 28-year-old was a regular at Stardbrook Road before injury last season restricted him to only a handful of appearances.
Shamrock Rovers (2009-2010)
Longford Town (2010)
Drogheda United (2011)
Drogheda United (2018-)