By Isaac Seelochan Jamie Carragher has no doubts that Manchester United youngster Kobbie Mainoo will be in England’s Euro 2024 squad. Mainoo, 18, made his Three Lions debut in the recent international against Brazil, before starting against Belgium three days later and producing a man of the match display. It capped a meteoric rise for the teenage midfielder, who has made just 20 senior appearances in all competitions for United so far. His senior England debut came after being selected by Gareth Southgate, having initially been picked for Lee Carsley’s Under-21 squad. Now former England defen…