Victor Osimhen has become the second Napoli player to score in three straight games in a European competition in the 21st century after Dries Mertens.
Osimhen scored Napoli's second goal in their 3-0 thrashing of Legia Warsaw in a Uefa Europa League game on Thursday.
The 22-year-old started the encounter on the bench and he was introduced for Hirving Lozano, just before the hour-mark.
Both teams were tied for the majority of the game but Lorenzo Insigne broke the deadlock for Napoli in the 76th minute and his Nigerian teammate doubled the lead, four minutes later.
Another substitute Kostas Manolas also registered his name on the scoresheet, five minutes into the stoppage-time.
