Thomas recently took in a loan spell at Blackpool, and it is during his time at Bloomfield Road that he caught the eye of other Championship clubs.
Blackpool are keen on making his move permanent, but they now face stiff competition from a number of second tier rivals.
Watford and Derby would both welcome the opportunity to add a proven goalscorer to their ranks.
Both clubs are looking to piece together squads they hope will fire them into promotion contention before the season is out.
Bournemouth will also need to agree to a sale, with Thomas having returned to the South Coast with his reputation enhanced.