Ciftci, 23, hit 16 goals for Dundee United last season, cementing his position as one of Scottish football's most deadly strikers in the process.
The Turkish forward has his fair share of admirers having scored so many goals for Dundee United, and interest is building after the former Portsmouth man rejected a new contract to stay at Tannadice.
The Scottish Sun believe that Dundee United's rivals Celtic have made a £900,000 bid to sign Ciftci - but they have rejected the offer, and will refuse to do business with Ronny Deila's men having sold Gary Mackay-Steven and Stuart Armstrong to them in January.
The report states that Middlesbrough are now leading the race to sign Ciftci this summer, with Celtic having to look elsewhere in their pursuit for a new striker.
Deal or no deal?
Dundee United are adamant that they won't sell Ciftci to Celtic so soon after losing their two star midfielders to the Bhoys, but how much would it take to strike a deal?
The Daily Mail believe that Middlesbrough are set to table a £1.7m bid for Ciftci, and whilst Jackie McNamara's men don't want to sell to Celtic again, they would surely consider a deal if Celtic matched or even went above that offer, especially with the forward available for free in a year's time.
Whether Celtic go in with another bid remains to be seen, but Dundee United's defiance may have just put Deila off making another offer this summer.