Blackburn now have two Olssons on their books after manager Steve Kean completed the signing of Martin's twin brother Marcus.
Centre-back Martin joined Rovers on transfer deadline day in 2006, and now winger Marcus has followed suit.
Blackburn's official website has confirmed Marcus has joined the Ewood Park club on a free transfer from Swedish side Halmstad, signing a two-and-a-half-year deal through to the summer of 2014.
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