MADRID, Spain -- Real Madrid defender Alvaro Arbeloa will be sidelined for nearly two months by a knee injury, putting the Spain internationals participation at the World Cup in jeopardy. Blake Griffin Clippers Jersey . Arbeloa said his right knee is worse than he thought "but if everything goes well, Ill be out from six-to-eight weeks." The 31-year-old right back has been a regular for Spain since it won the 2008 European Championship, but was left out of coach Vicente del Bosques last…