Watch: Callum McGregor Shares a Moment with Former Teammate Jack Grealish

Before Celtic and Manchester City clashed in a thrilling 4-3 friendly, a pre-match moment unfolded in the tunnel between Callum McGregor and Jack Grealish. The two footballers, who once shared dreams of professional success during their time together at Notts County, briefly reconnected in the tunnel before the sides took to the field...