"Craig had been away most of the week - it was not easy for him," said Rafael Benitez.
"He arrived back in Liverpool only late on Friday. It had taken him several hours, so he did not have too much sleep. This made it almost impossible to use him.
"I will wait to see how he is during the week with the trial. But he will be in Cardiff for two more days, for sure - so maybe involving him against Portsmouth on Wednesday will be difficult."