The South Korea international has had a blistering start to the SPL season and his recent performances have convinced Lennon that he is very much part of the club's long-term future.
Both Blackburn and Tottenham are reportedly interested in Ki but Lennon confirmed the 22 year-old will be staying put for now despite the player's rising market value.
"I think Ki will make the club a lot of money one day. He is unquestionably a ?10million player like Aiden (McGeady). He is certainly coming into that bracket now," Lennon told the Evening Times.
"He has turned heads already. There is nothing substantial that I'm aware of, although I know there is interest in him. But we want to keep our best players."
Ki moved to Parkhead two years ago but only saw limited playing time as he slowly acclimatised himself to the rigours of top-flight football in Scotland.
Now he has become an integral part of Celtic's midfield and Lennon believes the former FC Seoul player has the potential to develop into something special.
"He is a real asset for the club now, a wonderful footballer. He is everything you would want in the modern day midfield player. He is 6ft 2in, a fantastic athlete, very good on the ball under pressure," he continued.
"He is a good at passing, excellent with both feet and has a goal in him as we saw again against Dundee United on Saturday. So we think he can turn out to be a really world-class player."
Source: Team Talk
Source: Team Talk