Real have drawn Gala in the quarterfinals.
"If a team gets to the quarter finals, they deserve to be there," said Karanka.
"It would be a mistake for us to think that this is an easy tie. Galatasaray have very experienced players; some have played for us and there are others too like Drogba; it will be a tough tie. But we still have league games to play before the tie. There will be time to focus on that game and weigh up our opponents. Our focus now is on tomorrow's game because that is our next fixture."