The clash pits two of the continent’s highest ranked teams against each other, a matchup that has left pundits, media and fans struggling to call a clear favourite.
Speaking ahead of the final, the centre-back explained why he agrees with the notion the spectacle could be one for the books.
"It's another huge game against another big team, and when you reach the final of AFCON, you have to play this kind of game, and it's the kind of game in which the details will make the difference. We have to keep our concentration, discipline and desire to win the Africa Cup of Nations."
Saiss hopes this generation of Morocco players end the 50-year wait for an AFCON title under coach Walid Regragui.
"Winning the AFCON is the dream of all Moroccan people, they've been waiting for this trophy for fifty years now, so we can't wait to end the long wait and win the final on Sunday night."
In his reaction to beating Nigeria in the semifinals, Saiss – who was an unused substitute – admitted it was a tense affair.
"It was a stressful game, but I think we stayed focus for 120 minutes and we stuck to our plan. At the end, we deserved to win although it was a penalty shootout because we were very strong and we created a lot of chances."