Earlier, Anelka had beaten management to the punch by announcing on Twitter he had chosen to terminate his contract.
They subsequently released another statement on Friday night, which said: "Nicolas Anelka's purported termination of his Premier League contract this evening via social media was invalid as this was not conducted under the correct legal process as required by his contract.
"The club considers the conduct of Nicolas Anelka on December 28, coupled with his purported termination on social media this evening, to be gross misconduct.
"As a result the club has tonight written to Nicolas Anelka giving him 14 days' notice of termination as required under his contract."
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