Has to be a Bayern win, and a big win at that.
Goal difference could come into it and Napoli will score a load if they have to against Villarreal in their last home game.
A draw for us at Napoli, albeit a decent result, would put us on eight points, allowing for a win tonight for us.
Napoli would be on six points should they lose against Bayern, following the above scenario.
Meaning a gap of only two points going into the last game. Bayern would have qualified already, having beaten Villarreal in their next home tie.
Regardless, I would not be comfortable going into a final game with Bayern still needing a win.
Bayern winning tonight will give us the breathing space to at least allow for the above.