The 23-year-old was long courted by Premier League outfit Chelsea, which was widely reported to be set to secure a deal before Barcelona moved to hijack the agreement.
It was the second time in the window a late Barca move had frustrated the English side, with the Blaugrana beating them to the signature of Raphinha from Leeds United, while they also signed Andreas Christensen on a free transfer from the Blues.
For Kounde, though, the key to his decision was the conversations he had with Xavi.
"I had some good conversations with Xavi, he always expressed desire for me to come here, and that was important for me," he said.
"This is an important moment in my career, and in the conversations, he asked me to continue to do what I was doing in Sevilla, to continue to be aggressive, bring the ball out from the back, distribute, those are some of my strengths.
"Barcelona is a great club, very demanding as well, and that's something that Xavi talked to me about."
Kounde's arrival at Barcelona comes as part of a significant recruitment drive from Xavi's side, with Robert Lewandowski, Raphinha, Christensen and Franck Kessie fellow new arrivals.
However, the France international has an advantage due to his experience of playing in Spain and believes he will quickly settle into the club.
"My knowledge of the league is going to make it easier to adapt as soon as possible, to adapt to the Barcelona style as well," he explained.
"My coach is obviously going to ask me to know my team-mates as well, and that's going to take time, but it won't be a problem.
"There is lots of competition, I think it's very good for the team. It's good to have a lot of competition in each spot; there are lots of games, of course.
"What I have to do here is grow and learn. I'm very young still, and I'm here to help the team at any given moment, whatever the coach asks of me and my team-mates.
"It's good that there is competition, I'm really looking forward to playing, and when there's competition, it's a challenge and that's great."