The 24-year-old has been a regular fixture for the Premier League side since joining from Sporting Lisbon in the close-season, but a foot injury may leave him sidelined again on Saturday.
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"Ricky van Wolfswinkel is touch and go for Saturday," he said. "We'll assess him closer to the game.
"Johan Elmander has been training and is back fit."
The 54-year-old was also full of praise for Cardiff boss Malky Mackay ahead of what arguably represents a relegation six-pointer.
"Malky Mackay has done an incredibly good job Cardiff," he added. "I watched them a lot last year and they fully deserved promotion.
"We all know it's a results business - if we keep playing as we are, we'll be ok."