The young Frenchman has been released by Everton and is in talks with German Second Division club FC Erzgebirge Aue.
Foot Mercato says Gueye has visited Erzgebirge Aue's facilities this week, passing a medical.
However, he is also in contact with Ian Holloway's Millwall as he considers his options.
Gueye spent last season on-loan with Strasbourg.
For the big stories and the banter follow us on Twitter: @tribalfootball