Seedorf made the remarks while speaking on Amazon Prime after PSG’s dramatic 5-4 victory over Bayern Munich in the first leg on Tuesday night.
Kvaratskhelia played a decisive role in the encounter, scoring twice as the French champions edged a nine-goal thriller to take a narrow advantage into the return leg.
“Kvaratskhelia is the best player in the world and he’s only going to get better,” Seedorf said.
“I don’t know if he will stay on the left side because he just knows what to do in every situation.
“He carries the team in certain moments so I like his intelligence. He’s the extra man in midfield and also goes to make a difference up front.
“He’s unbelievable.”
Paris Saint-Germain will now head into the second leg with a slim lead as they aim to secure a place in the final of Europe’s premier club competition.