The 18-year-old Portsmouth College graduate, earned a surprise call-up to the England Schoolboy squad last January.
He played for the Three Lions against Australia at Lilleshall National Sports Centre before appearing in the prestigious Centenary Shield Home Nations tournament in March and April.
After that he joined Sydenhams Football League (Wessex) Premier side Blackfield & Langley.
And then Ngalo re-signed for the Watersiders in the summer, returning to Gang Warily after joining towards the end of last season.