Joshua Zirkzee would have been desperate to get in on the act when introduced during Manchester United’s 7-0 shellacking of Barnsley in the Carabao Cup. Fresh off the back of a resplendent ‘nine-and-half’ performance during Saturday’s 3-0 win over Southampton, Erik ten Hag’s decision to bring the £36 million summer signing off the bench with Barnsley already battered, bruised and beaten was surely one made with a goal or two in mind. But, in his half an hour on the pitch, Joshua Zirkzee would not double his tally in a Manchester United shirt. As Marcus Rashford, Antony, Alejandro Garnacho and …