Former Japan international Miura, who earned nearly 90 caps between 1990-2000 scoring 55 goals, joined Oliveirense in January on loan from promoted Japanese J1 League side Yokohama.
"Miura Kazu continues at UD Oliveirense," the Liga Portugal 2 side said on Twitter on Tuesday, without specifying the length of the new contract.
In November the owners of Yokohama, restaurant operator Onodera Group, became a majority shareholder of Oliveirense.
Miura, considered one of Japan's football greats, started his professional career in Brazil in the 1980s, where he played for Santos, Palmeiras and Coritiba, among others.
He joined second-tier Yokohama in 2005 from Japanese top-tier side Vissel Kobe.
Miura also briefly represented Japan's futsal team in 2012, and was called up for the 2012 Futsal World Cup at the age of 45.
