I'm sure other clubs are interested and I'm sure they've been told by his manager that his strong preference is to get to the Dees.
This would be part of his manager's legwork, wouldn't it? Unless Houston was for some reason adamant about the Dees from the outset, his manager will have sniffed out who's offering the best contract and who has the pieces to get a deal done among all the teams his client was willing to move to.