Caleb Porter's side added the former Chivas USA defender, while releasing the 2012 Supplemental Draft pick
McKenzie, 26, was drafted by Kansas City in 2008. He spent two seasons there before he was waived and picked up by RSL, where he spent another two seasons before his contract expired. He was picked up by Chivas USA in 2012 and made 20 appearances before being released on February 22, 2013.
Ryan Kawulok, 23, was selected in the 2012 Supplemental Draft.