Everton boss Martinez unsure of Cardiff fans 'welcome'
Martinez is a former Swansea City manager.
"I had a really good time in south Wales," he said. "I will get a welcome - I'm just not sure what it will be.
"I have great memories from my time down there but we will have to be on our guard because after deservedly beating Manchester City last weekend, they will be looking for another good performance."
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