The Ukrainian star bagged two goals in our memorable 3-2 victory at West Ham in Sunday's FA Cup quarter-final.
That took him into double-figures in what he admits has been a tough season.
Looking drained in the tunnel, he admitted: "I feel more and more confident after every game but it is always difficult after playing in the Ukrainian championship to go into the English Premier League.
"In England every game is very difficult, very important and the first season for every player is very hard, very, very difficult.
"I don't think I have shown my best form yet though."
Sergei claimed one of the goals of the season with a sweet volley in the first half before sliding home his second. He then crossed for Gary Doherty's third as we held on for a 3-2 win and a semi-final date against Arsenal.
At the final whistle he threw his shirt into a jubilant visiting end - a thank-you to fans who have stuck by him as the flak has been flying.
He added: "It means very much when the fans chant my name. I just want to say thanks to them for all their support, they give me so much support and it means a lot. The first season has been very difficult for me and that has been helpful."
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Sergei Rebrov dedicated his double at Upton Park to the fans and promised: "I'll get better."