The 20-year-old sustained a hamstring tear in Sunday’s defeat at West Ham.
The England Under 21 international has become a first-team regular since Kenny Dalglish took over as manager at Liverpool in January.
Kelly will miss Liverpool’s key clash with rivals Manchester United on Sunday.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.