Sakho's agent Willie McKay said: "Lamine is to spend a few days training at Bolton.
"[Bolton manager] Sam Allardyce is losing a number of players during the African Cup of Nations and he is looking to bring in new players.
"Lamine enjoyed his time in England with Leeds before he got injured and he would be keen on a return. He has struggled to establish himself at St Etienne and he wants to be playing regularly.
"We will see how he goes during training and he could make a loan move in January if all goes well."