Robert Samuel Rojas Chávez (born 30 April 1996), is a Paraguayan professional footballer who plays as a centre-back or right-back for paraguayan club Olimpia and the Paraguay national team.

[2] Rojas, who arrived in Guaraní when he was 17 years old acknowledged that he was about to leave football more than once because he missed his family, played as a right back for most of his youth training, but in his second year in the Asunción team he was run for playing as a centre back.

The one born in the small town of Peguahomi became a key part of the Cacique team, especially since Julio César Cáceres - his great referent in the position- was suspended by doping at the beginning of March and a place was left vacant in the rear.

On 18 January 2019, Rojas joined Argentine Primera División club River Plate, signing a four-year contract.

[3] On 2 March 2019, Rojas received a call-up to the Paraguay national team from Eduardo Berizzo ahead of that month's friendlies with Peru and Mexico.