Chivas USA have parted ways with a quarter of players as they prepare for the 2012 MLS season.

Defender Michael Umana, midfielder Marcos Mondaini, goalkeeper Sergio Arias and forward Victor Estupinan have all been released by head coach Robin Fraser.

Costa Rica international Umana has already moved on to Guatemalan outfit Comunicaciones with Fraser speaking highly of him but saying a shift in personnel was required for the club to move forward.

"Michael is a great character and a true batter and I have a great deal of respect for him as a person," Fraser told to MLSsoccer.com.

"But in the end, we need to make changes and we certainly had an eye on adding some different pieces for this year. He was great for this team, but it was just time to mutually part ways."

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