Sky Sports understands a number of clubs are tracking highly-rated Carlisle United midfielder Brad Potts.
Sheffield United are planning to send Andy Butler back out on loan after seeing an agreement with Walsall collapse.
Aberdeen have announced that goalkeeper Jamie Langfield has signed a new two-year contract.
The 32-year-old returned to first-team action this month after suffering a brain seizure last summer.
The former Dundee player joined Aberdeen in 2005 and has made 226 appearances for the club.