 Cleyton signed for Panathinaikos in the summer of 2008 for a fee of €1,700,000.Since then he has scored 5 goals for the greens, one being a fantastic overhead kick against his former club AEL.Cleyton Start the 2011-2012 season well, by scoring very important goals for the greens such as a direct free kick against PAOK and a fantastic overhead kick against Levadiakos.