Crusaders Head Coach Todd Blackadder said Lee-Lo was an attractive prospect after solid seasons with both Counties and the Hurricanes.
"We looked carefully at his performance during this year's Super season, and he had some great statistics. He is a strong, physical back who will be a useful addition to our squad, bolstering our mid-field stock,'' Blackadder said.
Lee-Lo said he was excited to be joining the Crusaders camp and looked forward to training and playing alongside some of New Zealand rugby's most experienced and highly-regarded players.
"This is a fantastic opportunity for me and one I could not pass up,'' he said.