QPR will monitor the fitness of Grant Hall ahead of the clash with Cardiff.
Hall made his first start since April following a lengthy battle with a knee injury at Millwall on Friday night and appeared to be struggling towards the end of the game.
"The nature of the injury he's had for the last six or seven months is one where we're all hoping that he doesn't get a recurrence of the tendinitis," boss Ian Holloway said after the 1-0 loss to the Lions. "We'll have to wait and see."
Josh Scowen is available after suspension, while Luke Freeman returned from a ban at The Den and should keep his place. Jack Robinson missed out through illness on Friday night but may yet recover in time to face the Bluebirds.
Cardiff winger Junior Hoilett should return against the club he made over 120 appearances for between 2012 and 2016.
Hoilett dropped to the bench for Friday's home defeat to Preston after a bout of illness but came on as a second-half substitute.
Bluebirds boss Neil Warnock is considering changes after three successive defeats, but his options are limited by a heavy injury list.
Aron Gunnarsson (ankle), Sean Morrison (groin), Danny Ward (knee), Kadeem Harris (knee) and Jazz Richards are all out, while Craig Bryson and Joe Bennett face fitness tests after picking up festive knocks.