César Augusto Yanis Velasco (born 28 January 1996) is a Panamanian professional footballer who plays as left winger for Chilean club Cobresal on loan from Costa Rican club San Carlos.

Born in Panama City, Yanis played for local sides San Francisco, Chorrillo and Costa del Este.

On 31 August 2021, he moved abroad and joined Spanish Segunda División side Real Zaragoza on a one-year loan deal.

[2] In 2025, Yanis moved to Chile and joined Cobresal on loan from San Carlos.

[3] Yanis made his debut for the Panama national team in a 0–0 friendly tie with Nicaragua on 26 February 2020.