Sky Sports sources understand Celtic missed out on Newcastle United striker Leon Best before the transfer window closed on Tuesday.
The Bhoys were keen to bolster their attacking options for the remainder of the season and targeted the 25-year-old after failing to agree a deal with Real Betis for Jorge Molina.
The Parkhead club wanted to bring in the striker on loan for the remainder of the SPL season, but the Magpies reportedly preferred a permanent transfer.
With Magpies boss Alan Pardew landing Papiss Cisse in January to feature alongside Demba Ba, Best's starting opportunities are expected to be hindered.
However, Best turned down the possibility of a stint at Parkhead with the deal understood to have fallen through after he failed to agree personal terms with the SPL giants.
The ex-Coventry City marksman scored four Premier League goals from 16 Premier League appearances, including winners against Fulham and QPR.