Ribeiro has 16 goals and 11 assists in 43 appearances in all competitions for the Brazilians this season.
Sirino spent a number of years plying his trade alongside Ribeiro at Sundowns ahead of his switch to Kaizer Chiefs this season.
Speaking ahead of the Nedbank Cup final, where Amakhosi face rivals Orlando Pirates in Durban this weekend, Sirino says he expects his friend to win the prestigious award - after losing out to Sundowns goalkeeper Ronwen Williams in the race for last season's award.
Sirino said in the Citizen: "Lucas Ribeiro is a top player and my friend.
“I think he has the quality to be player of the season, the numbers are there, he plays very well in every game. For me he is the best player in South Africa right now."
Sundowns are closing in on an eighth consecutive Premiership title and Ribeiro could add to his tally against Chippa United on Tuesday night.
South African football continues to make waves on the continental stage, with three clubs - Orlando Pirates, Mamelodi Sundowns and Stellenbosch FC - earning spots in the latest top 20 African club rankings.
Kaizer Chiefs midfielder Gaston Sirino is reportedly in hot water with the South African Revenue Service (SARS) over an outstanding personal tax bill amounting to R6.1 million.
Kaizer Chiefs went through another underwhelming campaign in the league but found some salvation with their Nedbank Cup title victory.
Mamelodi Sundowns and Bafana Bafana captain Ronwen Williams has called on the nation to rally behind Masandawana as they prepare to represent South Africa at the 2025 FIFA Club World Cup in the United States.
