He has played for Villa at right-back, on the right and left sides of midfield and as a second striker, while Capello even employed him as a left-back when he came on as substitute against Belarus at Wembley last month.
Carew said: "James should be on the plane for the World Cup - absolutely. He has been our most consistent player for a while now and he almost never has a bad game.
"He can play anywhere on the field, he is right and left footed and can be a very important player for England.
"But still you need a player who can come in and do the job for you, whether it's on the left or the right without lowering the level of the team, and James fits that bill.
"If he is not first choice he can be a very good second choice and is a player you can put in any situation in the game and almost any position on the field, and know he is good on the ball, and is always consistent.
"That versatility might well help him with England and he deserves to go to the World Cup."