Tuesday resultsNapoli 3-1 ChelseaCSKA Moscow 1-1 Real MadridANDRE Villas-Boas insists he has no concerns over his future despite seeing Chelsea suffer a 3-1 defeat against Napoli in the first leg of their UEFA Champions League last-16 tie.The Blues boss was already under pressure having seen his side slip out of the top four in the Premier League in the wake of a four-game winless run before Saturday’s 1-1 draw at home to Championship outfit Birmingham in the FA Cup.A series of blunders handed Napoli the advantage ahead of the second leg at Stamford Bridge, with Juan Mata’s opener for the visitors cancelled out by Ezequiel Lavezzi’s brace and an improvised finish on the stroke of half-time by the outstanding Edinson Cavani.Raul Meireles was at fault for Napoli’s first goal, while Branislav Ivanovic was caught out for the second before David Luiz added to his personal bloopers show-reel in the second half."After the first goal we had a big chance to go 2-0 up, there were some big missed opportunities, and then we should have done better with our defending.”Villas-Boas raised eyebrows by leaving experienced trio Frank Lampard, Michael Essien and Ashley Cole on the bench, but was in no mood to discuss his decisions in the aftermath of the defeat.He said: "It is a team selection. I can go on and explain it but it makes no difference to you guys, you will just have to analyse it and make your opinion. It was based on who was there for the team at that moment and was the best team in my thoughts.”Edinson Cavani put the hosts in front when he used his shoulder to divert home in first-half injury time before a glaring error from David Luiz allowed Lavezzi to make it 3-1 on 65 minutes.