The Parkhead club had reportedly seen two initial offers rejected over the past fortnight, but have now been successful at the third time of asking with an offer thought to be around £1.5million
The Turkish striker will now discuss personal terms with the Scottish Premiership champions
A statement on www.dufc.co read: "Dundee United today confirmed that an undisclosed fee had been agreed with Celtic for Nadir Ciftci and permission has been granted for the Glasgow club to speak to the player."
Ciftci, who joined United for free two years ago, has 12 months left on his contract
The 23-year-old must be registered by Saturday if he is to be available for the Hoops' Champions League qualifier against Icelandic side Stjarnan FC next Wednesday
The Tangerines, meanwhile, are due to fly out on a pre-season trip to Holland on Thursday.
Source : PA
Source: PA