Tom Aldred joined Blackpool from Accrington Stanley at the end of the 2015 January transfer window.
After progressing through the youth system at Carlisle United, the centre half has been with the likes of Watford and Colchester United in the past.
He joined Stanley in 2013 and went on to make 92 consecutive starts, avoiding injuries and suspensions.
Aldred made his Pool debut against Nottingham Forest in February 2015, but was sent off in the second half.
The defender went on to make a further five Championship appearances last season.