That's utter nonsense IMO, sorry.
So no good footballers can just decide to stay in Scotland? He captains the best side in Scotland. Has won more honours than most clubs here have in their history and plays CL football most seasons.
He's their highest earner, just had a testimonial and has a place in history.
There's been plenty of rumours over the years about clubs in for him but I don't think he's interested in going to a Southampton or that, which is his choice.
To say he's not a good footballer is just nonsense. You notice his absence whenever he's out the Celtic side. You certainly did when he was out the Scotland side.
I'm not saying he's a world beater but he could easily slot into a midfield for the likes of Everton, Burnley or the likes.