Blues want speed, depth as star's exit looms

Carlton are preparing themselves for what could be Tom De Koning's last outing for the Blues. (Joel Carrett/AAP PHOTOS)

As Carlton brace for ruckman Tom De Koning's expected exit, coach Michael Voss wants to add more speed and depth to the underachieving Blues' list.

Free agent De Koning will play his 100th and likely last game for Carlton against Essendon on Thursday night, and is then expected to take up a bumper seven-year deal from St Kilda worth around $1.7 million per year.