However, the Millers cannot afford to rest on their laurels and they must now further consolidate their spot in the second tier. They may need to strengthen their squad in order to do that but Championship talent rarely comes cheap.
With that in mind, here are 11 players out of contract this summer who may interest Rotherham.
1. Kevin Long
The experienced defender ended the 2022/23 campaign with Birmingham City.
2. Jordan Thorniley
The defender stood out for a struggling Blackpool last season.
3. Tarique Fosu
Fosu is familiar with the Millers having spent time on loan at the club last season.
4. Harvey Knibbs
Knibbs is set to leave Cambridge United and has been linked with numerous Championship clubs
5. Matthew Lowton
As a former Sheffield United and Huddersfield Town defender, Lowton is no stranger to Yorkshire
6. Mason Bennett
His three-year stay at Millwall is set to come to an end.
7. Liam Moore
The 30-year-old is leaving Reading after seven years at the club.
8. Ryan Nyambe
The 25-year-old has plenty of Championship experience.
9. Aden Flint
The defender was part of the Sheffield Wednesday squad that sealed promotion back to the Championship last season.
10. Sonny Bradley
He helped Luton Town secure promotion from the Championship last season.
11. Sam Clucas
The midfielder boasts Championship and Premier League experience.
