Lucas will make his 200th appearance for the club tonight against West Bromwich Albion.
"Lucas will tell you himself he still has a bit to go," said the Northern Irishman.
"When you are out for a year the medics and physiotherapists will tell you to put that time on again before players are back to their best.
"He is someone that is working ever so hard at his fitness. He has shown a great determination and work ethic to get back to that level and his recent performances have shown he is well on his way to that recovery."