Nilsson joins in time for new season
Nilsson added: "I'm very excited about the move. As with many players from Sweden, it has always been a dream of mine to play in the Premier League," Nilsson told the club's official website .
He added: "When you are a little boy growing up in Sweden the only league that people follow with any interest is the Premiership, so to play there is a great challenge.
"It is a much tougher competition than the Swedish league and I think my game will develop just my playing with and against players of this calibre."