England striker Peter Crouch has revealed he is concerned his physical approach could lead to a World Cup suspension.
Crouch was penalised for innocuous challenges throughout Saturday's 1-0 win against Paraguay in Frankfurt and erratic Mexican referee Marco Rodriguez showed him a yellow card for persistent infringement during the second half.
Another booking in England's second Group B clash against Trinidad & Tobago would see the Liverpool man hit with a one-game ban.
"Am I concerned I am getting singled out by referees? It was frustrating on Saturday," admitted Crouch.
"In the Premiership I wouldn't get pulled up for half of the things I got pulled up for against Paraguay.
"But that's international football. You have to adapt to it and I am sure I can. It was overly fussy at times but you don't want to blame referees and I'll maybe have to adapt my game a touch.
"It is a worry for myself - and Steven Gerrard as well - getting a booking so early in the tournament.
"With the way we both play, it is a concern. I am not going to drastically change my game, but I'll obviously have to bear it in mind for the future."