In his column for The Sun, Redknapp wrote: "Deep down, Alex Ferguson will not be happy about it.
"Just as we enter a critical period of the season with the Christmas fixture pile-up, United head off for a SIX-DAY tournament in the Far East.
"Boardroom ruling bootroom again but it is the price big clubs are paying in the modern game.
"For Alex it is Catch 22. He wants the best players in his team. To do that he must be able to offer some of the biggest wages in the business.
"And to do that, United’s ‘brand’ has to be continually pumped and milked like a cash cow.
"So off he goes to Japan to play the mighty Gamba Osaka on Thursday in the semi-finals.
"No one gives a toss, except those ringing the tills at Old Trafford.
"But it is the world we are in."