Bravo spent one season with Sporting, tallying nine goals and two assists over 28 appearances, including 26 starts. His efforts earned him an inclusion in the 2011 MLS All-Star team from Commissioner Don Garber.
"We want to thank Omar (Bravo) for his time with Sporting Kansas City on and off the field," Manager Peter Vermes said. "His competitive nature and savviness played a big part in our first season at LIVESTRONG Sporting Park. We wish him nothing but success in his new ventures."
For Kansas City, the move frees up both an international and a Designated Player slot on the team's roster, giving it more flexibility as it strives to maintain its position on top of the Eastern Conference in 2012.
The move for Bravo represents Cruz Azul's first buy of the transfer window as the team looks to rebound from another disappointing playoff exit and prepare to compete in both the Clausura and Copa Libertadores at the beginning of 2012.
"I want to thank Peter (Vermes), the Sporting Kansas City ownership, and MLS for a great opportunity and experience during the memorable 2011 season," Bravo said. "For personal reasons, I am returning to the Primera División but I do not want to rule out a return to Sporting KC and MLS. The quality of play in MLS is high and rapidly rising so I feel well prepared for my new challenge."Bravo has spent most of his 10-year professional career in Mexico with Guadalajara, but also had short spells at Tigres UANL and at Spain's Deportivo La Coruña before joining Kansas City. The 31-year-old forward has played 65 times for the Mexican men's national team and scored 15 goals for his country.