Modise singled out the likes of Alassiouty Sport's Gift Links, Maritzburg United duo of Fortune Makaringe and Lebohang Maboe, saying they must continue working hard for the national team.
The Cape Town City midfielder used the regional tournament as a stepping stone to launch his international football career over a decade ago.
Modise was speaking after the hosts lost to Madagascar in the quarter-finals last weekend, but they managed to redeem themselves with a 4-1 win over Namibia in the Plate semi-finals on Tuesday.
The man who used to wear the famous number 10 jersey for the national team, said it is good that the players had an opportunity to don the national team jersey, but advised that they must take the tournament seriously.
The former Mamemlodi Sundowns and Orlando Pirates star was named the Cosafa Player of the Tournament in 2007 after Bafana won the event by beating Zambia 4-3 on penalties.
“They have had an opportunity to play a couple of games‚ which is good for them,” Modise told TimesLIVE .
"I've also been impressed by the boy who plays in Egypt‚ Gift Links. So Maboe‚ Makaringe and Links have caught my eye,” acknowledged Modise.
“I’ve been following their games and I think they could do better. Our team is one of the best assembled teams‚ but we haven’t really justified that with the results,” he said.
"I would tell them that if they have the ambition to play for Bafana Bafana’s first team‚ they must take the tournament very‚ very seriously‚” he added.
“It’s a stage to prove [that] you are ready for international football‚ because the PSL and the international stages are two different things‚" Modise continued.
“And many players don’t understand the difficulties and the challenges of playing on the international stage,” said Modise who played 66 times for Bafana.
“In the PSL‚ you play against players you know and teams that you watch on a regular basis,” he reacted.
"At national [team] level‚ you meet players that you don’t know and by doing so‚ you need to perform better than you do in the PSL,” he noted.
"So many players take their club performances to the national team and that’s wrong,” added the 35-year-old.
"You need to understand that for the national team, you need to be at your best at all times‚” he concluded.
Meanwhile, Stuart Baxter’s troops will tackle the Zebras of Botswana in the Plate final at Peter Mokaba Stadium on Friday afternoon.