June 2 (Reuters) - Seattle Sounders players called for a bigger slice of the prize money for competing at the Club World Cup this month by wearing T-shirts emblazoned with "Cash Grab" and "Fair Share Now" ahead of a Major League Soccer match on Sunday.

Seattle are set to earn at least $9.55 million for competing at the June 14 to July 13 tournament in the U.S., where the total prize money runs to $1 billion, but under the MLS collective bargaining agreement (CBA) the players' share is capped at $1 million per club.

Seattle are one of three MLS teams that will compete in the expanded 32-team Club World Cup. Teams from North America are guaranteed almost $10 million just for participating and can earn more depending on their results.

MLS did not immediately respond to an emailed request f

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