The 37-year-old will travel to Porto Alegre in southern Brazil on Thursday to sign for his new club until the end of the year, with Boca receiving compensation of $200,000.
"No one could guarantee that I'd play again," said Abbondanzieri, who was dropped last weekend as Boca try to pull out of a slump.
"In this position (goalkeeper) you have to put up with it when there is a change," he told reporters as he left Boca's Bombonera stadium. "I feel I can still do my bit and not suffer when Sundays come around."
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