Nelson Semedo was on Friday presented as a Barcelona player after completing his switch from Benfica.
The club announced 24 hours earlier that an initial fee of EUR30million had been agreed for the Portugal defender who has signed a five-year deal at Camp Nou after passing a medical.
Barca reportedly turned to Semedo after being rebuffed by Arsenal in their pursuit of Hector Bellerin, with a new right-back having been designated one of their priorities for next season.
The 23-year-old is new coach Ernesto Valverde's third signing of the transfer window, following the arrivals of Gerard Deulofeu and young centre-back Marlon.
President Josep Maria Bartomeu stated this week that they hope to complete "two or three" deals before the window closes next month.