Christie has been brilliant for us, barring a dodgy spell at the end of the 2014/15 season where the entire squad effectively capitulated.
Adding to that he's still only 23 so has potential to improve further, he's easily one of our most talented youngsters hence his consistent place in the first team.
If Cyrus wanted to move to a prem club, I wouldn't blame him but I definitely wouldn't be actively looking to sell him...