The former Hoop-cum-Hornet told FansFC how big Dan had been crucial this campaign but wouldn't put a price on the centre back:
'He's under contract and it would be a big money signing,' former Celtic defender Mackay has said.
'As far as how much, God knows. Whether the club would want to sell him or not I don't know but everyone has their price.
'He's a big strong aggressive lad and playing for his country regularly now. Shittu scored a lot of goals for us this year, many of them from set pieces, and is probably one of the finest headers of a ball I've seen.
'He is learning the game all the time, is powerful and probably ideal for Scottish football.
'If you saw him in the flesh you would not believe the size of the man. He's huge. I'd say he's even wider than Bobo Balde. He's wide as the Clyde.'
Lets just hope that Rangers will be put off bidding for a player with the reccommendation of a former Parkhead player!