The 29-year-old moved to St. James' Park from Stoke in 2017 but found first-team opportunities hard to come by.
A former Spain Under-21 international, Joselu hit seven goals in 52 appearances for the Magpies but featured just 17 times across all competitions last season.
While he had fallen down the pecking order at Newcastle, Joselu's departure means further depletion to the attacking options available to the new manager.
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