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For 7 million euros, they acquired the center-back Christian Zapata.
The footballer, who has also dominated clubs like Bayern Munich and Liverpool, put his signature on a five-year contract.
24-year-old Zapata, who has worn Udinese's jersey for six seasons, should join his new teammates after the Copa America championship.
Villarreal finished fourth in the Spanish championship, so they will compete in the Champions League qualifying round.