In August 2019 he signed for Oxford United in a player/ambassadorial role, with the intention that he would join an Indian club on loan. In September 2019 he moved to Indian club Real Kashmir on loan. Siddiqi received his first national team call-up to the Pakistan under-23 team in May 2007 for the Beijing 2008 Olympic Qualifiers, making his debut against Bahrain, and playing in two further matches against Kuwait and Qatar. He was called back up to the under-23 team in 2010. In 2008, he was called up by the senior team to take part in the SAFF Championship, and later that year he earned one full international cap. In March 2011, Siddiqi was named in the provisional 37-man squad for the upcoming AFC Challenge Cup qualifying matches. Siddiqi has also played for the 'Pakistan XI', a team composed of Europe-based players of Pakistani origin which competes in friendly games. In 2011, Siddiqi founded the Kashif Siddiqi Foundation, with the aim to encourage increase the participation of British Asians in association football. Siddiqi has also attended meetings with the English Football Association on the matter. In April 2011, Siddiqi and the foundation played in a charity match to raise money for the Sodje Sports Foundation, Bury Hospice and The Bury Fusilier. He is also an ambassador for Kick It Out. He is also the co-founder of the "Football For Peace" organization. In November 2013, Siddiqi was honoured by Prince Albert II of Monaco for his charity work.