"It was hard at first to play in the Premier League but I was lucky to play every single match and that helped adapt and get used to my new team-mates," Lee told the Lancashire Telegraph.
"Chu-Young will need to do the same if he is to settle quickly.
"He's a good friend and he will be a threat if he plays. He's very quick, smart and technically good.
"Bolton will have to watch out for him.
"I would've have liked to have played against him and, when I get back to UK, then I will get in touch with him."