The young stopper has been a revelation for Rudi Garcia's OM this season and has attracted interest from across Europe.
Mercato365 says among major clubs keen are Chelsea, which had a scout posted to see Kamara in action as they lost to Lyon last weekend.
Kamara is tied to OM until 2020 and so far new contract talks have stalled.
The 19 year-old has been likened to PSG defender Thiago Silva. He's been on Chelsea's radar since he was coming through OM's youth team three years ago.