In his role as Ireland's assistant manager, coach Chris is better placed than most to talk about the wingman's quality.
And he's in no doubt as to the impact of Duff and Arjen Robben playing together has made to Chelsea's season.
"Two seasons ago at Blackburn he had a very good season, scored a few goals and I can remember him coming to White Hart Lane late on in the season and playing well," said Chris.
"What Chelsea have got at the moment is two players in Duff and Robben who are having a new lease of life.
"People like Terry and Lampard have played all the games whereas Duff and Robben perhaps got their season started later than anyone else.
"Robben was injured in the early part of the season and is now in great physical shape and Duff didn't play as many games at the start of the season either.
"They changed the system to a 4-3-3 and the fact that Robben was missing for the early part perhaps dictated the way they played. He's now fit and they've adapted Duff's position and, knowing him like I do, I knew he could play in the right because he has that flexibility. He just gets better all the time."
Chris Hughton believes Damien Duff is getting better and better.