Burnley manager Steve Cotterill has turned down Celtic's £500,000 bid for teenage striker Kyle Lafferty.
Lafferty has been capped seven times for Northern Ireland
"The bid that has been made for Kyle is nowhere near acceptable," Cotterill told the club website.
"With those words we are not encouraging anyone to come back with a bigger bid because he is not for sale.
"We are looking to build our squad and be better and Kyle Lafferty is not only one for now, but he is one for the future at Burnley."
The 6ft 4in 19-year-old is a Northern Ireland international, having already won seven caps for his country and scored one international goal.
And the youngster has indicated that he would welcome a move to Glasgow.
"Celtic are a huge club and I'm honoured to be the subject of a bid," Lafferty told BBC Sport when the approach was first revealed.
Lafferty has bagged four league goals for Burnley this season, making 11 starts and 13 appearances as a substitute.
"Obviously there's a long way to go but I'll be talking to my club and my agent," added Lafferty, who moved to Turf Moor from NFC Kesh in the summer of 2004.
"I'll also have to have a long chat with my mum and dad.
"Celtic are massive and the lure of European football is very appealing."
However, Cotterill is adamant that Lafferty is staying in the English Championship.
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Celtic missed out on Arsenal's teenage forward Anthony Stokes, who chose to join Sunderland after a succesful loan period at Falkirk.
And the Scottish champions are unlikely to meet Burnley's valuation of Lafferty.
"Look at David Nugent at Preston," Cotterill told the Daily Express. "They value him at around £6m.
"Kyle is two years younger and a full international, so you would have to put the same value on him - if not more!"