Parker admits playing for Serbia aggravated the issue.
He explained, "He has been struggling for a few weeks with an ongoing issue, he played for Serbia in a tough game with Portugal and came back and he didn't have a chance today.
"Whether we can get him right for Tuesday will be on a day to day basis. We'll try get some treatment into him but I coudn't make a call for Tuesday. He has something wrong with his stomach."
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