gundogan expects to complete a £ 15m move to old trafford in summer .
hummels has indicated he 's finally ready to become a united player .
the move will be as part of a £ 50m-plus borussia dortmund double raid .
both have privately let it be known they feel the time is right for a new start .
louis van gaal will be handed a £ 150m summer transfer kitty .