Sammy Lee said of his latest capture:
"I am delighted that we have finalised the deal to bring Christian Wilhelmsson to Bolton. We have been working on this deal for some time and our patience has paid off," Lee told the club's official website.
"He is a versatile winger and will add a new dimension to our new style of play we are going to implement this season.
"One of his greatest attributes is that he is capable of playing on both the left and right flank with relative ease. He likes to attack and will give us the perfect outlet to provide good service to our attackers.
"His attacking prowess comes from his blistering pace and is regarded by many as one of the quickest players in the national team. He has the potential to light up the Premier League with his pace and skill.
"The English game will suit his style and with the quality we have already attracted to the club we are building a very capable squad.
"Other clubs from around Europe have shown an interest in the player and it is a major coup that he has decided to join Bolton."