Derby County midfielder Ben Davies has signed a new one-year contract.
Strikers Theo Robinson and Nathan Tyson are among seven players to be made available for transfer by Derby.
Derby County have agreed a deal to sign striker Chris Martin from Premier League side Norwich City.
Sky Sports understands Derby County are on the brink of signing Norwich City striker Chris Martin on a permanent basis.
Burnley goalkeeper Lee Grant has agreed a deal to take him back to former club Derby.
Derby County boss Nigel Clough is confident his side will be involved in the next season's promotion shake-up.
Millwall preserved their Championship status for another year despite slipping to a 1-0 defeat at Derby County.
Chris Martin admits he would be open to the prospect of making a loan move from Norwich City to Derby County permanent.
Tom Naylor, James Bailey and Callum Ball have all returned to Derby County following the end of their respective loans spells away from the club.
Ludovic Sylvestre's injury-time goal earned Blackpool a 2-1 win over Derby County and ensured Championship survival for the Seasiders.