Reid, who was appointed India coach in April 2019, led the team to a historic bronze medal finish at the Tokyo Olympics in 2021.
A win against England, ranked fifth in the world, on Sunday will help India put one foot in the quarterfinals of the World Cup.
Defender Amit Rohidas has been named Harmanpreet's deputy.
Five Indian players and the head coaches of both the men's and women's teams in Tokyo claimed the top honours across different categories.
The camp will take place at the Sports Authority of India campus and the core group will undergo a mandatory quarantine period before re-starting training.
Forced to hit pause the button after touching its all-time highest world ranking of fourth, the Indian men's hockey team did not train for more than five months due to the COVID-19 pandemic.
The Australian oversaw India's entry into next year's quadrennial extravaganza with victories over Russia in the qualifiers.
The 33 players will report to coach Graham Reid at the Sports Authority of India in Bengaluru on Sunday to prepare for the upcoming Belgium tour later in September and the Olympics qualifiers in October/November.
The Australian's appointment till the end of 2020 was ratified on Monday after Hockey India received necessary clearance from the Sports Authority of India.
Reid's name was finalised in a meeting between Hockey India and SAI officials on Tuesday. He was picked over a number of candidates, including Jay Stacy, another Australian and a three-time Olympic medallist.