After a loan period at Peterborough United, Sheehan returned to the Bantams ahead of last Saturday's final home game of the season against Barnsley. The Irish defender was named as an unused substitute for the fixture.
Following the completion of his own loan deal at Vanarama Conference side Chester FC, Oliver McBurnie is also now back among Parkinson's squad ahead of Sunday's final game of the season at Crewe Alexandra.
The Scottish U19s striker is a doubt for the match, however, due to a minor calf injury.
McBurnie scored five goals over two separate loan spells with Chester FC this season, including four in his last seven matches with the Blues.
Gary MacKenzie and Francois Zoko, who have both been on loan to City from Blackpool this season, will definitely not feature against Crewe after leaving the football club.