According to the football411.com website, Modise joined the Brazilians from Orlando Pirates in 2010, although his current deal at Chloorkop is set to expire in June.
However, the playmaker, who was a surprise omission from the Bafana Bafana squad for the 2013 Africa Cup of Nations, will hold contract extension talks with Sundowns on either Monday or Tuesday, according to agent Jazzman Mahlakgane.
"I had a chat with Yugesh Singh (Sundowns legal adviser) to talk about Tsholofelo (Modise). There will be no problems at all," Mahlakgane told The Sowetan.
"I think we will meet on either January 7 or 8 with Yugesh, depending on his schedule. We are quite confident Tsholofelo will still be with Sundowns next season.
"He is enjoying his football and wants to help Sundowns win trophies. It's good that we will be dealing with his new contract at a time when Sundowns are doing well in the league campaign after a poor start to the season."
Mahlakgane went on to reveal another of his clients, Punch Masenamela, is also set for a new deal with the Tshwane giants.
"Just like Tsholofelo, Punch has been doing well at Sundowns and wants to remain with the club. I do not anticipate problems with his deal," he added.
"Sundowns are professionals. They are one of the PSL clubs it is lovely doing a deal for a player with."