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The 20-year-old is mainly a forward but he can also play as a right winger, and starred in his season-long loan at Huesca last campaign.
Having scored twice in his sole international cap for Colombia, Hernandez is tipped for a bright future in the game but appeared unlikely to break into Watford’s first team this season.
He scored 20 goals across two seasons at Huesca - whom he helped to an inaugural promotion in 2018 - including four strikes last season, finding the net against both Barcelona and Real Madrid.
Hernandez joined the Hornets from Granada in the summer of 2017 and has also had a loan spell at America de Cali in his native Colombia.
He now appears set to be the latest loan arrival at the islanders following Takefusa Kubo joining on a season-long loan deal from Real Madrid.
