The 23-year-old midfielder missed the Foxes pre-season games against Birmingham City and Sheffield United.
Ndidi was pictured in training with Kelechi Iheanacho and Leicester City teammates after his self-isolation upon his return to England from Nigeria.
— Leicester City (@LCFC) September 3, 2020
The former Genk star has been linked with a move to Tottenham Hotspur, Real Madrid, PSG, and Chelsea in recent months.
Ndidi scored twice in 32 league appearances as Leicester City finishing fifth last season in the Premier League.