AMSTERDAM, May 29 - Rafael van der Vaart suffered a fresh ankle injury when the Netherlands resumed their World Cup preparations on Monday.

The SV Hamburg midfielder was sidelined during Saturday's 1-0 win over Cameroon and abandoned Monday's training session after a ball struck his recently operated-on ankle.

Coach Marco van Basten told reporters: "It is obvious that his ankle is not comfortable and we will have to see how serious this injury is."

The Dutch meet Mexico in another friendly on Thursday.