(Telecompaper) TeliaSonera is again considering the possibility of selling its 77 percent stake in Spanish mobile unit Yoigo after rival telecoms provider Masmovil Ibercom expressed an interest in acquiring Spain's number four operator, according to unnamed sources cited by Bloomberg. After nine years of activity in Spain, Yoigo still boasts over 3.4 million customers but its relatively low market share remains a concern to the Swedish parent company, which could raise around EUR 500 million from a sale of its stake, said the sources. Private-equity firms are also interested in the unit and may team up with Masmovil to push through the sale, added the sources. MasMovil has a long-held ambition to take over from Yoigo as Spain's fourth national integrated operator and recently acquired broadband assets from Jazztel that enable it to offer fibre services to around 720,000 households in Spain.