Addicks boss Alan Curbishley has made Spurs an offer too good to refuse, according to a report in The Sun newspaper.
Gardner has been injured since September, but recently returned for the North Londoner’s reserve side, and is looking forward to resuming Premiership action over Christmas and the New Year.
He said: "I've got to show a bit of patience. With four games in ten days over Christmas you've got to be fortunate to play in every game."