Marshall had said before last Thursday's game he was wearing the shoes to attract attention to Mental Health Awareness Week. Marshall has been treated for a personality disorder in the past.
Marshall posted the league letter informing him of the fine on Twitter and wrote: ''Football is my platform not my purpose. This fine is nothing compared to the conversation started & awareness raised.''
Marshall said he had planned to match any fine with a donation to his foundation, which supports mental health awareness. He said he also plans to auction off the shoes and donate the proceeds to charity.
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