Reports have suggested Newcastle are lining up a move for De Jong during this month's transfer window as they look to boslter their squad.
However, De Jong's representative, Louis Laros, claims the classy midfielder is happy at Ajax and will probably stay at the Amsterdam ArenA.
"There has been a lot of interest in Siem but at the moment he is the captain of Ajax, and he is happy at Ajax," Laros told Sky Tyne and Wear.
"I expect he will stay until the end of the season. But you never know."