According to Portuguese sports daily<i> A Bola</i>, Sporting Lisbon might unilaterally terminate the contract of USA international Oguchi Onyewu.<br /><br />The experienced defender had a knee operation in the United States without the permission of club medics.<br /><br />For a start, the 31 - year - old has been sent to train with the B Team of Sporting Lisbon.<br /><br />Due to his lack of first team opportunities, Oguchi Onyewu spent last season on loan at Malaga.<br /><br />He has suited up 17 times for Sporting Lisbon in the Primeira Liga since his arrival in the summer of 2011.<br /><br />Photo Credit: fifa.com <br />