Harrison makes move to Gigg Lane.
Development squad defender Scott Harrison has joined League Two side Bury on loan.
The 20-year-old former Darlington youngster will remain at Gigg Lane until January 1 and could make his debut against Exeter this weekend.
Harrison, a centre-back, made 15 appearances for the club’s development squad last season, plus a further eight during the current campaign.
He also played 10 games at senior level for Darlington before joining Sunderland in October 2012.
Bury, who are managed by Ronnie Jepson, are currently 20th in the fourth tier with 18 points from 18 games played.