The 23-year-old will cost Barca around 30 million euros (around $34.25 million) and will undergo his medical tests at the Camp Nou Stadium on Friday, reports Xinhua news agency.
The Barcelona website describes Semedo as an "offensive full-back with superb physical attributes" and he has played 63 games for the Portuguese champions in the last two seasons.
Semedo is Barca's second signing of the summer after the club decided to take up the buyback option on Gerard Deulofeu and will provide competition for Sergi Roberto on Barca's right flank.
His arrival will also end interest in signing Arsenal right back Hector Bellerin, who himself if a former Barca youth team player.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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