The Wales star, 31, clarified his present situation on Monday while on international duty after comments last week that he "is only doing a season at Spurs" caused a stir.
However, he has hinted that returning to Real doesn't necessarily mean he will play for them again amid reports he doesn't feature in their plans for next season.
He said: "Going into next season, my contract says legally I have to go back to Real Madrid which is what I stated.
"I'm not being disrespectful to anybody, that's literally what I have to do.
"Real Madrid are I guess my parent club and as far as I agreed I am on loan at Tottenham until the end of the season and then I go back. That is the plan so far.
"The reason I left is because I wanted to play games and get match fit and enjoy my football.
"Obviously come the summer I will be going back to Real Madrid and will go from there. The plan is to go back and whether then I sit down with my agent and decide is something I will do in the summer."