Celtic first-team coach Alan Thompson admits Ki Sung-yueng is attracting interest from other clubs but is adamant the Bhoys will not sell.
Blackburn Rovers are thought to be tracking the South Korea midfielder while a handful of wealthy Russian clubs have also expressed an interest.
Thompson believes the 22-year-old has a 'massive' future and insists Celtic will not let him go this transfer window.
He said: "I think there has been well-documented interest in the lad and rightly so, he is a terrific player with a massive future but not one we are looking to get out the door.
"We don't want any of our better players leaving."
Thompson was speaking after Celtic's 2-0 win over St Mirren in the Scottish Premier League, a victory desperately needed after back-to-back defeats to St Johnstone and FC Sion.
"It was important that we got three points today, no matter how we got them after the disappointment of Thursday and last Sunday," said Thompson, who's side won courtesy of two Gary Hooper strikes.
"In the first 20 minutes St Mirren struggled to cope with the way we started the game, the tempo, the energy, the power and the pressing."