Manchester United may soon be partying like it’s 1999 all over again. Now, we don’t mean another treble success in on the cards. For all the impressive progress made by Ineos behind the scenes since Sir Jim Ratcliffe seized control, this Manchester United side is still very much a work in progress on the pitch. But after years of their striking options consisting of one 30-something veteran and a crocked Antony Martial, could the Red Devils soon be choosing between three top-level centre-forwards in their prime? A throwback to the days of ’99, when Andy Cole and Dwight Yorke started the Champi…