PAUL Robinson suffered an ankle injury during Millwall's 4-1 defeat at Hull City on Saturday – his first game back after a double hernia operation in the summer.
Lions boss Kenny Jackett says his captain is now a doubt for the game against Cardiff City at The Den on Tuesday evening after he was forced off after 78 minutes at the KC Stadium.
"He's gone over on his ankle," he said. "He's got strapping on it so we'll see how he is over the next few days.
"If we want the clean sheets that we're working towards, and we haven't got one yet this season, we will need him fully firing and fit. He can contribute to our defensive stability."