ディエゴ・シメオネ
In June 2007, Guly was added to the coaching staff of cross-town rivals Estudiantes de La Plata, under coach Diego Simeone, with a third former Argentine international, Nelson Vivas, as assistant coach. Diego Simeone left Estudiantes de La Plata in December 2007 claiming a supposed lack of the club's commitment to sign appropriate reinforcements for the 2008 Clausura and Copa Libertadores. Guly also took up the same position with the same coaching staff at River Plate in 2008 and San Lorenzo in April 2009, where he also was the manager of the club's reserve team. Simeone and his staff, including Guly, resigned in April 2010. In June 2013, he was the assistant manager of Nelson Vivas, who Guly formerly had worked together with in the coaching staff of Diego Simeone.