United fan Dev Bhatia uploaded a picture of the jersey after seeing it at an adidas store in Delhi.
The shirt is beige in colour and features black trim. The words 'Manchester United Football Club' are embroidered into the bottom left corner of the design.
It is possible that the shirt could be a part of United's third kit rather than their away one.
Dev told the MEN that this is the second time he has come across an unreleased United shirt after he spotted the 2016-17 home shirt at a store in Delhi before it was officially released.
The leak comes one day after United unveiled their home kit for next season and it is now on sale in the United store.
Players including Paul Pogba, David de Gea, Marcus Rashford and Jesse Lingard modelled the new Adidas design in promo pictures and video ahead of Ole Gunnar Solskjaer's first full season in charge at Old Trafford.
duddiprs
62
too quick with the jesy but too poor now slow with the transfers
DaMhztourage
43
Very nice , and it will look fabulous on De ligt