The Turkish forward, 23, has already been the subject of offers from the Bhoys, and with just one year left on his contract it is expected that the striker would be leaving Tannadice this summer.
However, both previous offers did not match Dundee United’s valuation of Ciftci, and it appears as if they have finally matched the £1.5 million bid that Wigan put forward for the striker.
That bid was accepted, but Ciftci turned down a move to England’s League One, with his eyes set on a move to the Scottish giants.
The former Portsmouth striker, who moved to United in the summer of 2013, has netted an impressive 33 goals in 82 games over the past two seasons.
He will add an extra goal threat to Celtic’s side, with the need to find the back of the net evident, especially considering the Bhoys struggled in the goalscoring department during the 2014/15 season.
Leigh Griffiths was the only consistent goal scorer, and John Guidetti - who also provided a goal threat - has left the club. Ciftci will fix the one weakness in the Celtic squad, whilst further weakening another of their close rivals.
Following the acceptance of the bid from Dundee United, Ciftci is set to undergo contract discussions in the coming days, with pre-season in full-swing.