Osimhen scored Lille’s equaliser on the night and was a thorn in the flesh of Chelsea defenders for most of the game.
The goal was the Nigeria international first in the Chsmpions League for Les Dogues and seventh of the season.
Nigerian -born forward Tammy Abraham opened scoring for Chelsea in the 22nd minute following a pass from Fikayo Tomori.
“I know where he (Osimhen) comes from, I know his story he made a big game and managed to ask us a lot of problems in defense. He will make a big career,”Lampard told reporters after the game.
“He was hugely impressive. Tonight was going to be a tough match for our defenders. His performance individually was really good.”
Lille are without a win in the group from two games, while Chelsea have three points from same number of games.
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