Dykstra appeared Monday in a Los Angeles courtroom to enter his plea. The former star was charged last month with more than a dozen counts, including bankruptcy fraud.
Federal prosecutors contend the 48-year-old Dykstra hid, sold or destroyed more than $400,000 worth of items from an $18.5 million mansion without permission of a bankruptcy trustee.
Dykstra is being held in a Los Angeles County jail after state prosecutors recently filed grand theft auto and drug possession charges against him and two men.
He spent 12 years in the big leagues and helped the Mets to the World Series championship in 1986.
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