The 24-year-old has signed a five-year contract with the Spanish side and was presented by the club on Thursday.
“I come prepared to contribute as much as possible for the team to achieve its objectives. Playing in the first division of Spain is a challenge for me,” Jakobsen told Marca.
“I started playing as a central defender, but during the last two seasons I have played as a left-back. I’m used to this, although I can play on both sides. What I want is to start working now, give everything and convince the coach.”