N'Guessan's contract expires at the end of the season and he has rejected an offer to extend his time with the League Two club.
MK Dons failed with a bid for the former Rangers youngster in January, while West Brom and Sheffield Wednesday have also shown an interest.
Skysports.com recently revealed that Leicester City, Reading, Ipswich Town and Sheffield United are also monitoring the player's situation.
And Jackson concedes that, with so much interest in N'Guessan, it appears inevitable that the Frenchman will be on the move.
"A lot of clubs have been watching him for some time," said Jackson.
"Nothing will be sorted with him until the end of the season.
"I would like to keep him, but with the amount of clubs that have been watching him it is going to be really hard to keep him."