Callum McGregor: Trebles are so tough to win so we’re proud of what we’ve achieved

Callum McGregor knows how difficult it is to win the Treble. He also knows just how enjoyable it is to achieve that clean sweep of domestic honours. And the midfielder has now done so in five separate seasons, more than any other player in football. Each success is special in its own way, but the latest Treble triumph has particular significance, given that he has done so as captain...