The Cameroon international spent three years at Santiago Bernabeu, and admitted he had become frustrated with his lack of first-team opportunities in the Spanish capital.
The 24-year-old is due to return to Madrid at the end of the current campaign, but conceded it will be hard if he has to forego the first-team football to which he has become accustomed to.
"The most radical change is that I am now playing every game, and things are going really well for me," said Geremi.
"Playing, and playing lots of games allows you to demonstrate your quality, and your true level.
"If you are on the bench you can't demonstrate anything."
The midfield powerhouse also stated that it had taken him a while for him to adapt to the English game.
He added: "English football is very different to Spanish, much faster and more dynamic.
"In general, getting used to this country took longer than in Spain, which is more like Cameroon.
"But at Boro I can move all over the midfield, as the manager has given me a lot of responsibility, and I try to help the team with my experience and quality."
Geremi was however non-committal when quizzed about the possibility of joining the Teessiders permanently, declaring he had yet to consider the matter.
"The truth is that I have not thought about it.
"I'm am here on loan and I know I must return.
"We'll see what happens in the future, but in principle I came here for a year."
In other news, Boro midfielder Mark Hudson has extended his loan stint at Carlisle by a further month.
