The former Bafana Bafana ace sees his contract ends this season and the word is he already has his mind set on leaving due to the peripheral nature of his role at the club.
However, 'The Navigator', whenever he has been brought in for Sundowns this season, has made a difference - case in point being the tricky tie against SuperSport United earlier this month where his free-kick was headed in by Hlompho Kekana.
Friday's game against Golden Arrows saw him replace Mzikayise Mashaba and he tested Abafana Bes'thende stopper Nkosingiphile Gumede with a speculative shot which the 23-year-old keeper tipped for corner.
Modise then took the corner himself and put it right where defender Motjeka Madisha was attacking as Sundowns saw their lead doubled.
Mosimane, who brought in Modise from City Pillars when he was the coach of Supersport United, says he's not aware that Modise will be leaving the club.
"I don't know if he's leaving. Is it? Okay, but he hasn't told us. He hasn't told us, he hasn't told you, but I'm not saying he didn't say that [he's leaving]," said 'Jingles'.
"I don't say he didn't say that. All I'm saying is that now it's big games [coming up], big games you need big players, experienced players. Teko comes in a few minutes he helps us.
"Denis Onyango showed leadership [against Arrows] that he's an African footballer of the year and he did that. [Hlompho] Kekana, from last week to this week, he's been good so they've been good."
Since he came to Sundowns in January transfer window in 2011, Modise has won two league titles, the Nedbank Cup, Telkom Knockout, CAF Champions League and CAF Super Cup.