Cunha missed last night's home defeat to Everton after suffering a training ground injury in the lead-up.
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Before kickoff, Amorim explained: "It was a knock in the training.
"I don't know how long he is going to stay out. I think it's nothing serious but we cannot risk players.
"We have to show everybody, when you are not 100 per cent, we have a different player to cope with the demands of the game."
