The two clubs are ironing out the final details of a deal expected to be worth around €35 million.
The 24-year-old has given the green light to the move, having already agreed to join Aston Villa, with personal terms currently being finalised. The Premier League side are hopeful of wrapping up the transfer in the coming days.
Villa have moved swiftly to strengthen their attacking options ahead of the new season, with Guessand identified as a key target by Unai Emery and the club’s recruitment team.
Once completed, the deal would represent one of Villa’s major signings of the summer window as they prepare for a busy campaign both domestically and in Europe.