The South Africa international missed three consecutive games through injury over the festive period, and the Crystal Palace boss is worried that he has aggravated the problem
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The match saw South African Dikgacoi make a return to action following a hamstring problem, but Pulis admitted he was concerned about the midfielder from the outset.
He picked up a yellow card towards the start of the match and then told Pulis that his hamstring was once again causing him discomfort.
"He was a little bit flat I thought during the first half," he said.
"Then when he got booked early on, that was a concern for me. He said he felt it a little bit, so we just made the change."
The manager gave no indication as to when the 29-year-old would be available once again, but he is doubtful for Saturday's trip to West Brom in the FA Cup.