The teen moves to Pompey on a season-long loan after spending the second-half of last term on-loan with QPR.
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"Yang was an extremely highly rated player when he first came over to join Spurs in January," Portsmouth manager John Mousinho said.
"We believe he's a real prospect and know that Tottenham think highly of him, so this is the next part of his development.
"He's direct and exciting in the way that he plays and can really help us achieve what we're looking for this season."