The £168 million development features a new food court and shops including Next and H&M.
The Crown Estate, who own the site, said certain shops should be open for click and collect as early as the 1st April.
All other eligible businesses will be open from the 12th if the government's roadmap continues as planned.
Work has been underway since April 2019 with developers placing emphasis on creating an environmentally sustainable shopping area. As such they have installed 16 new electric car charging points, 500 solar panels and 5,000sqm of planted areas, including green walls, hedgerows, trees, insect hotels and wildflower meadows.
Michael Bell, Senior Asset Manager at The Crown Estate, said: “I’m so pleased to announce the completion of our development at Fosse Park.
"The last year has been a challenging period for us all, but our team have worked hard to achieve our ambitions.
"I’m delighted that we’ve still been able to involve the local community in aspects of the design, by using virtual forums to bring those discussions together.
“Fosse Park has been a much loved destination in the Leicester area over the last 30 years, and everyone at Fosse Park looks forward to welcoming visitors, when it is safe to do so, to enjoy the enhanced destination.”
Alberto Costa, Member of Parliament for South Leicestershire said: “I am really delighted to see the new extension at Fosse Park completed ahead of its phased opening in early course.
"Fosse Park is already the nation’s premier out-of-town shopping park, but this new, very welcome £168m investment will help increase footfall and bring new levels of economic benefits and employment to South Leicestershire and the wider region.
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