Keogh has been a mainstay in the Rams' team since Paul Clement arrived at the club, and he has formed a solid partnership with Jason Shackell at the heart of Derby’s defence.
Keogh and Shackell have helped Derby to maintain the second best defensive record in the Championship, with the side conceding just 11 times in their opening 16 matches.
And Keogh said: "I feel like I have done well in the previous games and for Derby, I feel like I am in the best form of my career."
Keogh is currently away with the Republic of Ireland, and his attention will be focused on getting his country to Euro 2016.
Martin O’Neill’s side take on Bosnia in the first leg of their qualifying play-off on Friday evening, and they will be desperate to book their place in France next summer.
Keogh’s attention will have to turn quickly back to Derby matters after the international break, though, as his side are gunning for promotion.
Clement’s men have climbed the table rapidly of late, and they are now just four points away from the automatic promotion spaces.