The Liverpool defender has returned to the international fold after a self-imposed three-year absence and was used as a second-half substitute against Mexico at Wembley on Monday.
Carragher has played under a host of different managers for club and country during his distinguished career.
But he knows that ultimately whether they are good, bad or indifferent will be decided by results - and he feels Capello's record should give cause for optimism in South Africa.
Carragher said: "Capello is a focused manager. He is that type of manager. It is difficult for me to say much because I have only been back with England a week.
"I don't think it is right to say 'one manager does this and it is right'. If you win, you are always right.
"Every manager has their own way of winning things, different England managers have their own ways, but the reason they become England manager is because they are very good managers.
"It is not that one way is right or one way is wrong - but this manager has his own style and it has proved successful over the years which is encouraging (for the World Cup)."
Carragher has had little problem in returning to the England fold after initially deciding to quit the international game following the friendly with Brazil at Wembley in June 2007.
He said: "The set-up is different in the sense of it is a different manager, and every manager has their own ideas and way of doing things, so that has changed.
"But in terms of the squad, the players, the backroom people, it is all the same and is always run very well, and always has been."