After starting Scotland's 2 - 1 win in Macendonia on Tuesday night City keeper David Marshall had to leave the field at half time with a hip injury leaving him doubtful for Cardiff's trip to Hull on Saturday.
Ironically Scotland's (and Hull's) first choice keeper Allan McGregor, is also injured and that's why Marshall started the last two games for Scotland.
If both fail to make it on Saturday Hull will call on new signing Steve Harper, while Cardiff will turn to Joe Lewis.