Steer has agreed to move to Aston Villa, with compensation still to be ironed out between the two clubs.
"Yes, I was sad to see him go," said Hughton. "We did offer him a contract but we all know that is the nature of the game. You can do your best that you can but ultimately it is down to the players. I was disappointed to lose Jed but what we have managed to do is get Declan (Rudd) out on a season-long loan, which will be great for him and his development.
"We expect him to come back a better keeper. Yes, we are in the market for a third keeper and that will give us three senior boys here."