The summer signing helped the Reds go unbeaten throughout December while also helping himself to two goals against Fulham in a convincing City Ground victory.
Mills has certainly proved his worth since arriving in Nottingham and manager Dougie Freedman is continuing his work to bring in equally effective signings during the January transfer window.
The Nottingham Post reports that a deal to bring midfielder Gary Gardner back to the club from Aston Villa has all but been agreed while other names in the frame include Manchester United's Nick Powell, a big-money signing from Crewe Alexandra for the Old Trafford but whose career has yet to take off as expected.