Isidor struck in Sunderland's 2-1 win at Chelsea on Saturday night.
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Afterwards, he said: "We're lucky to have Nordi Mukiele in the team. He's a machine.
"When we throw a long ball into the box, we have to be ready. I'm number nine, so I have to be ready in the box. The ball simply bounced off me, or maybe I was in the right position.
"People think we're a very young team, but we have a lot of character. First of all, we carry the Sunderland brand. We always believe in ourselves.
"Are we second?! How nice, isn't it? We're not second, it's not the end of the season. We have to keep focusing."