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Two-time European champions Chelsea beat Borussia Dortmund 2-0 on Tuesday to progress to the quarter-finals with a 2-1 aggregate victory.
Meanwhile, Napoli lead 2-0 in their round of 16 tie at Eintracht Frankfurt ahead of their return leg next week and have emerged as one of the tournament favourites, 15 points clear of Serie A.
Koulibaly left Partenopei for Chelsea at the start of the season and expects any reunion to be postponed until June.
"I hope to find them as far away as possible," Koulibaly told Sky Sports. "Maybe the final in Istanbul would be better. "We know how important Napoli is to me, but now I'm focused on my club.
"If we face them, we'll do everything to win, but I hope it's as far away as possible, and why not face us in the final?"
