Mazzarri is under pressure after Inter's derby defeat to AC Milan.
"We should definitely continue with Mazzarri next year," Jonathan told Sky Sport 24. "I am 100 per cent sure we should carry on with him.
"Clearly the critics at the moment are putting him under pressure and it has even been written that we players are not behind him.
"That is not true, we want to move forward with the current boss. He talks to everyone and we all talk to him all the time.
"He is a Coach who gives confidence to his players, he is prepared and he always wants to win. He is angry when we don't win.
"A great team like Inter needs a Coach like him.
"Clearly it is not just him who is sad that we lost, we are sad too. We still have a couple more days to work and we must now think about Lazio.
"They are a difficult team who always make it difficult for Inter."
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