[1] Gastanes was appointed general secretary of the Philippine Football Federation (PFF) on February 15, 2013.

[4] Gastanes was named secretary general of the Philippine Olympic Committee on August 8, 2019.

[5] His resignation from the PFF in 2023, automatically made him ineligible to continue serving his position as POC general secretary.

[9][failed verification] He also served as Alternate Council Member of the AESAN Football Federation for the term 2019 to 2023.

His platform included a focus on agriculture and strict regulations of the local mining industry.