Sanson is a former France Under-21 international, and he is reportedly available for around £15 million.
The 26-year-old has been with Marseille since January 2017, and he has been linked with numerous Premier League clubs over the last year or so, mainly Aston Villa and West Ham United.
According to top football journalist Fabrizio Romano, Aston Villa are now 'confident' that they will be signing Sanson from Marseille, stating that negotiations have 'opened also to find the agreement on personal terms'.
Marseille are set to sell him in order to fund some of their own January business, with them being keen on Napoli forward Arkadiusz Milik.
Sanson's value has dropped from around £25 million to £15 million possibly due Marseille's downturn in form, which has coincided with a recent muscle injury for Sanson, with Marseille picking up just five points from a possible 15 in the fives games that he missed out on.
Villa are keen to sign Sanson as a replacement for Conor Hourihane, who is being linked with a number of clubs, mostly Swansea City, who are making a push for Premier League promotion.
Marseille manager Andre Villas-Boas stated at the weekend that "The transfer window is open. Sanson is a player who is highly rated."
"He is a boy who interests English teams because of his characteristics and it is possible something could happen."
Aston Villa are currently 11th in the Premier League, but due to a COVID-19 outbreak within the squad, they have had most of their recent games postponed, leaving them with three to four games in hand over the rest of the league, which might propel them up to fourth if they win all of them.