The Bluebirds are concerned for their striker Pilkington who was injured in the second half of the 0-0 draw at Burnley. The 27-year-old was replaced by Aron Gunnarsson.
Cardiff manager Russell Slade told the BBC, "He's in a brace so we're taking all precautions,
"We just hope it's not too serious because he's done very well since we've converted him up there.
"I thought he was a threat all night for the two Burnley centre-backs."