The Ivory Coast international – who featured twice at this summer’s World Cup Finals – spent the second half of last season on loan at Palace and played 14 times, scoring twice.
One of those efforts came during the Eagles’ victorious UEFA Conference League campaign, with Guessand later appearing in the Final win over Rayo Vallecano in Leipzig.
The skilful forward, who grew up in Marseille, had spells with Lausanne-Sport and Nantes before breaking through with Nice in 2024/25, scoring 12 times and winning the club’s Player of the Season award.
After half-a-season with Villa, Guessand then moved to Selhurst Park on loan – where he became the first player to win two different European trophies in the same season, having also featured in Villa’s successful UEFA Europa League run.
He will be hoping to lift that very same trophy with Palace this time around, having become the Eagles’ fourth summer arrival after Óscar Mingueza, Takehiro Tomiyasu and Dwight McNeil.
Chairman Steve Parish said: “We’re thrilled to have the opportunity to welcome Evann back to Crystal Palace, after he gave us all a glimpse of his undoubted talent last season.
“We believe he can help us to deliver similar success this year, as we look forward to another exciting season for the club.”
Guessand said: “I'm so happy to be here.
"I already have good memories here – but I think it's only the beginning. I hope many more are coming.”
Everyone at Palace would like to welcome Evann back to South London, and wish him the best of luck upon his return.