Both veterans have made major contributions so far this season, but are off contract in June.
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"We don't know what is going to happen," said Amorim. "My goal is to continue to count on Casemiro, with Harry Maguire, that he has the same problem.
"I'm really happy with Casemiro, he is really important. I'm really happy with Harry.
"But let’s focus on this season and then we’ll see the next season."