Nedved admits they had been chasing the Argentine for some time.
"We talked to Carlos a long time ago," he said. "He still has a lot of desire to play football and to do well.
"You can see that enthusiasm in the way he has been training with us.
"Great players, once they have won a lot, need new motivation, new targets and I am happy that he has arrived.
"He instantly demonstrated that he wanted to join us and I liked that a lot."
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