The centre-back, who has been at Chesterfield for three years, will become a free agent on July 1 when his contract expires.
The 29-year-old, who has been out injured for more than a year, was offered the chance to continue his rehabilitation at the Spireites despite being out of contract.
Chesterfield re-sign former Notts County goalkeeper who has recently been playing European football
How Chesterfield could line-up against Aldershot Town
Why Chesterfield manager Paul Cook will continue to not select a goalkeeper on bench
Chesterfield set to announce signing of new goalkeeper ahead of Aldershot Town clash
'Active at both ends of market' - Chesterfield boss Paul Cook on latest transfer activity at Spireites
The experienced centre-half signed a new deal in March 2021 after some impressive displays at the heart of the Town defence as they surged towards the play-offs.
However, just one month later, he ruptured his achilles and then suffered another similar setback later on in the year, forcing him to miss the whole of last season.
As well as Chesterfield, Hollis has also played for Notts County and Forest Green Rovers, among others.
Like Hollis, full-back George Carline has been offered the opportunity to continue his recover at the Blues. It is not known at this stage whether he has decided to take up the offer.
Out of the four players who were offered new contracts this summer, Tom Denton is the only one whose future is yet to be decided. Jak McCourt, Jim Kellermann and Luke Croll all opted to move on.
Meanwhile, this time next week we will know who the Spireites will face on the opening day of the new season on August 6, with the fixtures set to be released on July 6.