Sevilla have signed Argentina right-back Gabriel Mercado from River Plate for an undisclosed fee on a three-year deal.
The 29-year-old represented Argentina at the Copa America Centenario in June where they lost to Chile on penalties in the final.
"Everything has happened so fast and I am feeling very anxious. This is my first day, I passed my medical, signed the contract and this will be my first training," Mercado told the club's website.
Sevilla signed Mercado as a replacement for defender Coke, who joined Bundesliga club Schalke 04 on Wednesday.
Sevilla, under new coach Jorge Sampaoli, take on Champions League winners Real Madrid in the UEFA Super Cup in Norway on Tuesday.
Striker Fernando Llorente is set to leave Sevilla to join Swansea.
The Swans have been looking for a forward following a string of summer departures and are now poised to land the 31-year-old Spain international, who is due to undergo a medical on Friday, ahead of signing a two-year deal.