If Clarke had called him up he could have asked McGinn over crushed avocado and toast at breakfast if he regretted not going to Celtic.
With a winning goal in the play off, playing every week in arguably the most entertaining league, salary jump and now a new one to match, not being hated by 1/2 of Glasgow (granted 1/4 will always despise you because of your secondary school) and your previous club fans .... I'm sure he'd steer him away. OK he's maybe gonna miss out on smoke machines, light shows and 60k unwashed singing you'll not walk alone in Europe but rather than jump on the first wave, jump on the best one.
Turnbull has age, plaudits from peers plus the jorno's, stats and potential on his side that others such as Moult, Randolph, etc. didn't. He had good advisors around him at the club. However 3 months till the window closes, plenty of time for a bidding war. Let the powers that be keep on stoking the fire.