The two clubs have been alerted of the player’s potential a while back and they have watched the player in action on several occasions this season.
N’Diaye came through the youth ranks at Tontien Bamako, and went on to join Moroccan side Wydad Casablanca in 2009.
He only spent one season there before signing for Vitoria Guimaraes in Portugal in the summer of 2010.
The 22-year-old has since established himself as a first team regular at the club and made a total of 37 Primeira Liga appearances, scoring 4 goals in the process.
Last year N’Diaye broke into the Mali national team and has earned 6 caps so far, although he missed out on the 2013 Africa Cup of Nations squad.