Osvaldo has cancelled his loan with Inter Milan to make the move to Boca.
He told reporters in Argentina: "If everything goes the right way, I'm fulfilling my life's dream.
"I know Boca well and I am enthusiastic. I'm here to lend a hand, with humility. I've been training alone for 20 days, I'm hoping everything goes well.
"For someone like me, who used to follow Boca as a supporter, this is a dream.
"But I'll wait for my medicals and the signing of the contract before saying anything else."
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