The Partenopei have a mountain to climb if they are to progress to the round of 16 in the continent's secondary tournament after conceding three away goals without reply at the San Paolo earlier in the week.
|COMEBACK ON THE CARDS?
|80/1||Napoli are 80/1 to beat Plzen 4-0 in the second leg with BetVictor|
"We felt a bit ashamed. It went horribly wrong and our fans did not deserve that," Hamsik wrote on his official website.
"I had a chance to equalise early in the second half but didn't take it. [If I scored], it would have ended differently. However, I did not find the space.
"We need to think about the game with Sampdoria, and we must do so immediately because the match against Viktoria Plzen has ended."