Parkinson confirmed Bolton's interest in Hobbs, who left Nottingham Forest at the end of last month, but played down talk of a move for ex-West Bromwich Albion goalkeeper Boaz Myhill.
Rangers need a new defender as David Bates looks set to leave Ibrox.
David Vaughan will reportedly join Jack Hobbs and Chris Cohen in bidding farewell to Championship side Nottingham Forest this summer.
Peterborough United have been linked with a move for Nottingham Forest's Jack Hobbs in recent times.
Could the Nottingham Forest and Hull City players trade places this summer?
Should Leeds take a second look at Nottingham Forest's Jack Hobbs.
Hobbs initially moved to Nottingham Forest on loan in 2013.
The defender initially moved to Nottingham Forest on loan in 2013.
A pairing of Michael Mancienne and Jack Hobbs is the answer to Nottingham Forest’s defensive problems.
Forest - and rivals Derby County - have been linked with the 19-year-old, while a return to Birmingham City has also been mooted.