[2] He moved to Bulgaria, joining Litex Lovech's academy, after catching the eye of the player agent Rogério Pereira.

[2] Ferares made his team debut for Litex Lovech in a friendly match against Macedonian FK Pelister on July 1, 2008.

In the summer of 2012, Ferraresso spent approximately a month training with Botev Plovdiv, receiving the approval of the manager Ferario Spasov.

[3] After a five-year stay with Cracovia, in September 2021 Diego Ferraresso returned to Bulgaria, being close to signing with Dobrudzha Dobrich, but eventually joining Botev Vratsa that was managed by compatriot Daniel Morales.

[6] In an interview for the Brazilian web magazine Medium in April 2018, Diego showed his desire to represent Bulgaria on international level and to play in the FIFA World Cup with the team.