But, on the plus side, midfielder Essien is fit again and in today’s squad, along with defender Ricardo Carvalho.
Hiddink said: “Paulo got injured yesterday and has anterior ligament damage. It means he is out for the season.
“But Essien and Carvalho both travel. I am happy to have two more players with international experience back in the squad.
“We want to get into the semi-finals of the FA Cup — the competition is highly regarded at home and abroad. But I have no priorities about the next two games.
“The next step after Coventry is very important against Juve. But I have not got any specific priorities.”