The South Korea winger has attracted interest following a number of impressive displays in his debut season in the Barclays Premier League.
Coyle, however, is keen to handle the 21-year-old's development and said: "He is a Bolton player and I see no reason why that would change."
He added: "He has done fantastically for us this season. But like any other player, I will sit down at the end of the season, review how long is left on his contract and what, if anything, we want to do.
"That's the way I have always worked and he will come under that."
Source: PA
Source: PA