In the first half of 2006–07 Bundesliga season, Bayern's leadership publicly stated its impatience with Dos Santos' progress. Club coach Felix Magath said: "It is clear that Julio's development does not please us, It does not make sense to keep a player at the club who does not create". This led to widespread rumours of his departure from the club; the speculation ended in December 2006, when Bayern announced they had reached a deal to send the player on loan to fellow Bundesliga side VfL Wolfsburg for the remainder of the season.[2] Having failed to break into Wolfsburg's first team (mainly due to a major injury), he returned to Bayern in June.
At the conclusion of the 2006–07 season, Dos Santos had made four league appearances, as well as one appearance in the 2006–07 DFB-Pokal and two appearances in the 2006–07 UEFA Champions League.
In June 2009, Julio went back to his original club Cerro Porteño to play the 2009 Clausura and Copa Sudamericana.
On 29 December 2014, Julio dos Santos joined Brazilian club Vasco da Gama.[4]
Before signing with Sportivo Luqueño, dos Santos rejected the opportunity to sign with Olimpia Asunción – being Cerro Porteño's rival – thanking however the club's president for interest in him but stating that his Cerro-ism would not permit him to join Olimpia.[5]