The January arrival from Aston Villa struck the only goal of the game on Sunday.
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"Today we fought for this win," Guessand told Palace TV. "I think we deserved to win today, even after a long time without a victory.
"But let's keep pushing now, because I think with the quality we have in this team, from the keeper to the striker, we can do something good.
"I thought the team showed really good determination to keep pushing and be patient. Because sometimes you can be a bit lazy after a red card (for the opposition), but we kept pushing.
"Every time they (the supporters) are here supporting us, we feel it. We felt it today. We felt again the support of our fans and that was really important."