The 50-year-old Spaniard was a race winner in 500cc, the category that became MotoGP, with Honda in 1995 at his home grand prix.
Italian Suppo announced his departure in November, a day after Repsol Honda's Spaniard Marc Marquez secured his fourth top-flight world championship in five years.
(Reporting by Alan Baldwin, editing by Toby Davis)
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