The 20-year-old spent the second half of last season on loan with the North London club before making the move permanent this summer.
Spurs splashed out £30 million to sign Tel from Bayern Munich, only to later be left out of Thomas Frank’s squad for this season’s Champions League league phase.
Speaking to The Telegraph, Tel spoke of his frustration in missing out on the squad but vowed to bounce back.
"To be honest, I was very, very mad for a lot of weeks,” he said.
“But I was like, 'use this and show him you need to be on the squad list'. Bad things help me more than good things to be better. So I will face a lot of bad things, but I'm going to be OK with that.
“I'm not in the squad list right now, but I will do everything to be in the squad list in January. This is a new challenge for me, I love challenges.
I’m a fair person and I was not on a good day for the (Super Cup), I didn't play well enough.
"If I'm a gaffer and I can see a player is not good enough, I will maybe do the same. So in my mind I was like 'this is fair because we've got a lot of good players. It's OK'.
“After the game against Leeds, he pushed me to the fans and that was quite emotional for me. Because he showed me that 'I didn't put you in the squad, but you're still there, I still believe in you, I'm still behind you'. It's not because 'you didn't do this or I don’t like you'."