....League North side Southport until the end of the season.
Priestley joined Port from league rivals Alfreton Town for an undisclosed fee in December 2017.
Priestley joined Alfreton in the summer after time spent at Salford City, where he made 41 appearances in 2016/17, and notably scored to equalise in their NPL Premier Division play-off final against Workington AFC.
Now 29, Priestley started his career at Accrington Stanley before moving to Colne at the age of 18.
The centre-back moved to Barnoldswick Town, and then made the switch to Ramsbottom United in 2013.
A move to Bradford Park Avenue followed in 2014 on a two-year deal and Priestley made 61 appearances in just under two years at the club - scoring 3 goals - before making the move to Salford in March 2016.
He has recently been on loan with Port`s league rivals FC United of Manchester.