Harwood-Bellis is a City player, but had been spending the season with the Saints.
After they won promotion back to the Premier League, they will now have to commit to the youngster.
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Per The Mirror, the loan deal includes an obligation to buy if Southampton gained promotion this season.
As they have now done so, beating Leeds United in the playoff final, Harwood-Bellis will be a Saint for some time to come.
He will now get to show his quality in the Premier League, with the expectation that he will be a first team regular next term.