The 32-year-old Malaga center-back pulled up during Saturday's friendly against Bulgaria but is confident that he will not have to withdraw from the Netherlands squad
The Malaga center-back sustained the injury during Saturday's 2-1 friendly defeat to Bulgaria, and the 32-year-old is set to be examined at Hoenderloo on Monday.
"I assume it will be nothing serious," Mathijsen told De Telegraaf. "Let's hope for the best."
Mathijsen had started the game against the Bulgarians but pulled up limp after just 16 minutes, and was promptly replaced by Wilfred Bouma.
An initial scan revealed no tear, but the severity of the injury has yet to be determined, meaning the former Hamburg defender is, at the very least, a doubt for his country's tournament opener against Denmark on June 9.
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