Deano arrived from Glenn's former club Southampton in September and burst onto the scene with a goal on his debut in the defeat by Manchester United.
Since then he has been involved with a side that has registered three straight wins in the league - and certainly looks the part.
"I think he's had a good impact," pondered Glenn. "I like the fact that he's snuggled in there and he looks as though he's been here longer than he really has.
"I believe there's more to come from Deano, I believe he's going to grow as a player and improve with better players around him. I think you'll see that over the coming months.
"He is a good defender and he's got good use of the ball. He will get better and I'm delighted with the way he's adjusted himself."
Glenn feels that having worked with Deano before might have helped the former Wolves star ease his way into to life at the training ground, an added reason why the boss tracked his former pupil.
"It may be easier because I knew him and John knew him and he had two friendly faces. If you go to a completely new set of faces it takes longer. That's why perhaps we went out on a limb to get Deano, with the fee, we knew he'd settle in quicker than maybe a foreign import."
Glenn is delighted with the settling in process made by recent signing Dean Richards and admires the way the big centre-half has made himself at home.