The 31 year old openly admitted during the last winter transfer window that he was keen to head back to San Lorenzo.
The Argentine international said: "You never know what can happen in football.
"In January we did all we could for a possible return to San Lorenzo, but I always made it clear that Newcastle would have the last word.
"The club have invested a lot in me and I must show respect towards them.
"I have to speak the truth, though, and I would like to return as soon as possible."
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