Both Spurs stars were on the scoresheet for last night's win over Mexico.
Crouch said: "Ledley has been brilliant. I've known Ledley for a lot of years and I know what a superb player he is.
"I've known Ledley since I was 13 in my first spell at Spurs. He was fantastic even then. Even then you knew he was going to be world class and he has proven that.
"As long as he can prove his fitness, he will be up there as one of the best centre-halfs at the World Cup.
"He has proved his quality this season, hopefully he has proved his fitness.
"He played the last three games of the season, all for the 90 minutes, he came through those and trained this week with England as well."