The 33-year-old, who has played 11 times for the Championship outfit this season, has also praised the influence of new boss Steve McClaren.
"I'm playing football again after missing a lot of last season due to injury so I'm really enjoying life at the moment," he told the club's official website.
"Hopefully with a few more games in the coming weeks I'll get even better. I know if I have a run of games I can be a positive influence on the team and I've been fortunate that a few injuries have given me an opportunity.
"It's a pleasure to play with these young lads, especially when they go forwards like they can do. It's an exciting team to play in. With the new boss coming in hopefully we will learn plenty more and improve because he is very good at what he does."
Derby currently sit 10th in the Championship table.