Leyton Orient will enter the Final Third Development League next season.
The O's will play in the reserve league after the competition decided to introduce a south division for the first time.
AFC Bournemouth and Luton Town will be founder members and will join AFC Wimbledon, Cambridge United, Gillingham, Peterborough United, Portsmouth and Orient in the inaugural Final Third Development League Southern Division.
The O's will play their home matches in the division at the Matchroom Stadium.
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