 His first taste of European football came on 15 October 2003, in an 8–0 rout of FK Matador Púchov in the UEFA Cup.However, López failed to establish himself in the main squad, and was subsequently loaned to S.S. Lazio for 2004–05.He made 14 Serie A appearances, played twice in the Italian Cup and three times in the UEFA Cup, but struggled to earn a regular starting position, and the Rome club decided against buying the player at the end of the campaign.