Real Madrid assistant manager
The Spanish champion has taken only one point from its opening two league games and trailed 3-2 from the first leg of the cup tie last week, but stormed into an early two-goal lead thanks to goals from Gonzalo Higuain and
The host then seemed in complete control when Adriano was sent off before the half-hour mark, but Barca recovered a foothold in the game through
Karanka believes Real should have put the game to bed in a devastating opening spell.
"Everyone has seen the response of the team, from the start we went for the game," he said.
"We had a lot of chances and the result could have been very different if we had scored all of our chances in the first half.
"In the second half we could have done a little more but the most important thing is the title and we are very satisfied. Now we have to continue with this kind of attitude."
"The first half belonged to us and generally the whole game did," Casillas said.
"Today Valdes had a 10 out of 10 game and at the end we had to suffer a bit more. I think the title was deserved, they didn't have many attacks but they were dangerous when they did.
"We came in on a bad run and the fans were doubting us a bit, but there are days when you have good luck and days when you have bad."
"In the second half where we attacked with 10 players until the end is definitely one of the proudest days I have had with these players in four years," he said.
"I wouldn't say we started badly. Madrid weren't running over us, they played two balls in behind that surprised us, although it is true that Higuain already had another chance.
"Madrid took their chances but I want to take the positives."
Netherlands and Spain secured progression to the semi-finals of the European Under-21 championship as both claimed wins in Group B.