The winger’s mother, Cilenis Marulanda, was rescued within hours by police after roadblocks were set up – but the search continues for his father Luis Manuel Diaz.
The footballer issued the appeal via an Instagram Story post on Tuesday night – as his mother and other family members took part in a vigil calling for the release of their relative.
The 26-year-old posted an image advertising the event, which said: “March for the release of ‘Mane’ Diaz”.
The post also featured details of the time and location of the vigil, and added: “Bring your candle to light the light of hope – FREE HIM NOW!”
Police air and land patrols have been searching a forest in northern Colombia amid growing fears Diaz’s father may have been smuggled across the border into Venezuela.
Image: Diaz’s mother, Cilenis Marulanda, at the vigil on Tuesday. Pic: AP
Image: The Liverpool star’s grandfather Alfonso Diaz also attended. Pic: AP
Colombian special forces have also been involved in the search of the region, which includes a mountain range that straddles both countries.
Police have offered a $48,000 (£39,000) reward for information which leads to the rescue of Mr Diaz.