MK Dons have signed midfielder Sergio Aguza from Real Madrid Castilla.
Sheffield Wednesday defender Tom Lees has committed his future to the club until 2019.
Hull have begun the process of reshaping their squad for the Barclays Premier League by offering new deals to four players and releasing a dozen others.
Defenders Paul McShane and Liam Rosenior have been offered new contracts along with goalkeeper Mark Oxley, while Abdoulaye Faye has automatically triggered a new 12-month deal after reaching a pre-agreed number of appearances.
But 12 players have been shown the door to make way for new arrivals, with long-serving defender Andy Dawson and former Arsenal trainee Jay Simpson the most prominent.
Also leaving the club are Paul McKenna, Seyi Olofinjana, Sonny Bradley, Lewis Clarkson, Mark Cullen, Jamie Devitt, Kealan Dillon, Daniel East, Daniel Emerton and Francis McCaffrey.
Six acadamey players - Daniel Chambers, Benjamin Clappison, Joseph Cracknell, Matthew Dixon, Paul McElroy and Sam Topliss - have earned professional contracts, but Thomas Davie, Bradley Ricketts and Joel Sutton will move on.