After a season-long loan with Real Mallorca, Kubo is set for a similar move next term.
Of the LaLiga quartet, it is the Submarino Amarillo who are leading the race to snap up Kubo.
The 19-year-old is attracted by all four suitors, but is leaning towards Villarreal.
His overwhelming priority is to go to a side where he will be given the kind of prominence that will translate into at least 40 appearances over the course of the campaign.
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