From AirLive.net:
Pilot of Air France flight on approach to Saint-Denis Roland Garros Airport (Reunion Island) this morning (tuesday) reported a floating object at about 44 miles off the island.
The Boeing 777 flight AF642 from Paris Orly was at 10,000ft during this observation. The plane landed at 9:43. The pilot could not give GPS heading of the object.
The Cross (operational regional monitoring centers and rescue ) asked a merchant ship, the only nearby ship to divert to check, but found no trace of any debris.
French authorities will send a Casa aircraft of French Air Force to will fly over the area according to Reunion media.
AirLive.net: Pilot of Air France #AF642 reported a floating object off Reunion island