[1] He enrolled into the IMG Academy three years later in order to further his football education, although he continued to return to Hong Kong every summer to train with Kitchee.

[7] Matthew scored his first Hong Kong Premier League goal in a 2–2 draw against Lee Man on 22 November 2020.

After an impressive performance during the 2020–21 season of the HKPL, Orr was named within the 25-man squad for the 2022 World Cup qualifying fixtures against Iran, Iraq and Bahrain.

[12] Orr was chosen as one of the over-aged players for the upcoming 2022 Asian Games to be held in Hangzhou, China from 19 September to 17 October 2023.

[15] Orr was born and raised in Hong Kong by a New Zealand father, Andrew and a Chinese mother, Janice Chin.