straight to your inbox every day for freeZlatan Ibrahimovic claims his biggest regret was not joining Manchester United at a younger age as he prepares for a reunion with his former club.The AC Milan striker will return to Old Trafford after the two clubs were drawn together in the Round of 16 of the Europa League.The then-36-year-old striker joined United from Paris Saint-Germain in 2016 but his debut season was cut short after he picked up a serious knee injury.Ibrahimovic signed a one-year