Cardiff captain Mark Hudson has been ruled out for the rest of the season with a hamstring injury.
Hudson said on Twitter: "Yes unfortunately I am out for the rest of the season. The hamstring injury at Man U was worse than first thought."
Despite finding first-team chances hard to come by, the 31-year-old has experience which the Bluebirds will miss in their relegation run-in.
Ole Gunnar Solskjaer's side are second bottom of the table and host Hull on Saturday.