The left-sided attacker teams up with his twin brother Martin after terminating his contract at Swedish outfit Halmstads and signing a two-and-a-half year deal at Ewood Park.Olsson has trained with the Lancashire outfit in the past and the 23-year-old now creates a partnership with his sibling down the left, with both players able to play either full-back or on the wing.\"It feels great, I tried not to think about it too much before it was confirmed, but I signed today and can finally take a breather,\" Olsson told Hallandsposten.Olsson is Rovers\' second signing of the day following the purchase of Bradley Orr from QPR as manager Steve Kean looks to bolster his squad in order to guide the Lancashire side away from the relegation zone.