Osimhen, who had served a ban in Napoli’s previous game after returning from Africa Cup of Nations duty for runners-up Nigeria, stole clear in the penalty area with 15 minutes remaining to fire home an equaliser.
Barcelona had taken a deserved lead on the hour-mark through Robert Lewandowski’s 93rd Champions League goal.
It was Napoli’s first game since they sacked head coach Walter Mazzarri after three months in charge and replaced him with Slovakian Francesco Calzona.
Napoli ended the game with gusto in search of a winner, but Barcelona managed to hang on for the draw.
The next leg will be in Spain on March 13.
AAP
