Sheehan signed a loan agreement with the Magpies this Friday which is scheduled to keep him at Meadow Lane until Monday 26 December 2015 (Boxing Day).
Subject to receiving the relevant clearances, Sheehan could now be in line to make his second Notts County debut against York City this Saturday.
The defender has been given permission by the Bantams to play in the Johnstone's Paint Trophy and FA Cup for Notts County.
The Irishman made over 127 appearances for Notts County in his first spell at the club between 2011 and 2014 before moving to the Coral Windows Stadium.
Sheehan's most recent appearance for City came in the third game of this season at home to Gillingham.