United executive vice-chairman Ed Woodward has flown back to Manchester from the club’s tour here to step up summer transfer business, with Germany’s World Cup-winning centre-back Hummels his top target.But Dortmund boss Jurgen Klopp insists neither Hummels nor Marco Reus – another United target – are for sale.He said: “I can assure everyone there are no indications that Mats or Marco want to leave. They will be playing for us in the new season.”Van Gaal will get his first look at United when th