Christensen was signed by Barca at the beginning of the season from Premier League giants Chelsea and has formed a formidable combination with Ronald Araujo at the heart of the Blaugrana backline, which has conceded just seven goals all season.
"At the back, we are seeing more of Araujo and Christensen in the central axis. Perhaps the defender who has surprised me the most is Christense , who is having a great performance and has adapted quickly," said Marques, who is also Mexico's most-capped player.
"There is no doubt about how important Araujo is and the player he is becoming.
"On the right, Koundé is doing very well, defensively he is very safe and the offense surprises us at times. And on the left, whether Alba or Balde plays, they have a very complete defense."
Xavi Hernandez' men kept yet another clean sheet at the weekend against Sevilla, that's now 15 from 20 games in La Liga so far in 2022-23.