The retired Canadian Armed Forces colonel is set to make an announcement at a downtown Ottawa hotel.
Stogran is already registered as a candidate on the Elections Canada website.
Veterans Ombudsman Pat Stogran holds a news conference at the National Press Theatre in Ottawa on Aug 17, 2010. (Photo: Sean Kilpatrick/The Canadian Press)
NDP MPs Niki Ashton, Peter Julian, Guy Caron and Charlie Angus are also registered, along with Ibrahim Bruno El-Khoury, the founder of a Montreal consulting firm.
The NDP says Stogran and El-Khoury must submit nomination paperwork and a registration fee in order to be official candidates.
The race to replace Tom Mulcair at the helm of the NDP ends in October.
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