Redfearn has also managed Leeds United and Rotherham United.
Shackleton starred as Leeds drew with Swansea on Tuesday night.
Neil Redfearn could return to the Championship with former club Barnsley.
The Irish talent has been released after five-and-a-half years with Leeds United.
Redfearn spent seven months as manager of Leeds United.
Leeds United are on a terrible run of form and will be hoping to turn things around this weekend.
Neil Redfearn managed Leeds United during 2014-15 after three caretaker spells in charge.
Leeds United face Middlesbrough at Elland Road with the Whites looking to turn round their poor form in the Championship.
Lucy Ward was Leeds United's head of education and welfare at the boys academy while Lewis Cook was at the club.
The Bournemouth man learned his trade at Leeds United.