The 28-year-old’s initial spell from Dagenham & Redbridge had concluded after Saturday’s 2-0 victory at Maidstone United, in which N’Gala scored the opening goal, but the centre back will now remain in E10 until January 20, 2018.
Speaking on the loan extension, N’Gala told leytonorient.com: “I have thoroughly enjoyed my time here and I am looking forward to continuing my stay.
“It was a good feeling to score my first goal for the Club on Saturday at Maidstone, but it was even more pleasing to get the win and clean sheet.
“The fans have been great with me over the past month. As a team we are now beginning to turn things around and I am determined to help continue this run of form.”
N’Gala has made five appearances for the O’s since arriving in November and is eligible to play against Bromley on December 30.