France had already lost full back Benjamin Mendy for the round of 16 clash against Argentina due to a small muscle injury and also missed training.
If Sidibe is ruled out, coach Didier Deschamps will be left with only two options for the quarter-final clash, though defender Presnel Kimpembe can also play at full back.
Sidibe has just recovered from a knee injury which forced him to lose his place in the France starting line-up to Benjamin Pavard.
(Reporting by Julien Pretot; writing by Sudipto Ganguly; editing by Christian Radnedge)
