Anelka himself declared on Twitter hours earlier that he had decided to terminate his contract with Albion, a day after it was confirmed neither he nor the Football Association would contest the five-match ban he was handed for his 'quenelle' goal celebration in December.
West Brom responded by issuing a statement themselves, in which they stressed they had yet to receive any formal notification from Anelka or his advisors.
And 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."
- the Football Association