Hoilett completed his move south yesterday.
Hughes said: "Junior is a player I know very well. He was just a young boy trying to make his way in the game when I had him at Blackburn.
"It was difficult for him then because of work permit issues, but I had him training with the First Team very early on because his talent was there for all to see.
"We knew then he was going to have a great future and he's certainly showed that talent over the last few seasons at Ewood Park.
"He's shown he's a player of top quality and a player that can makes things happen, both on his own and as a team player.
"He's certainly a player that will enhance what we've got in the group and I am delighted he's chosen to come to us."