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COLLINGWOOD has finalised its list for 2018 after signing category B rookie Jack Madgen.

The 24-year-old Madgen is a defender who grew up playing football in South Australia, but turned his full attention to basketball at the age of 18.

He spent four years playing as a point guard for US college Delta State University, in Cleveland, Mississippi.

Madgen comes from a strong basketball background, with sister Tess representing Australia and brother Ben a former captain of the Sydney Kings in the NBL.

"My brother had done the college scene and my sister was at the AIS for basketball when I had to make the choice," he told collingwoodfc.com.au.

"To be honest, I was probably better at footy, but basketball was a passion. I really wanted to go to college and get an education and university degree."

The Magpies expect Madgen to play on medium or tall forwards.

"In addition to impressive defensive capabilities, Jack has a huge work ethic and a real willingness to learn the game," recruiting manager Derek Hine said.

"He's mature, professional and will be willing to do extras to help improve his game."