Heading into Friday's (AEDT) Group F meeting on the back of six successive home wins in European competition, Arsenal was well below par, but substitute Pepe stepped up with a late double.

The result was far more than Arsenal were worth, with Vitoria - who took the lead through ex-Tottenham youngster Marcus Edwards early on - having crafted some excellent opportunities.

Gabriel Martinelli's equaliser had brightened Arsenal's prospects midway through the first half, though the Brazilian's header was swiftly cancelled out by Bruno Duarte.

But it was the much-maligned Pepe who had the final say with two devastating free-kicks - his second a spectacular effort in stoppage time which clinched the points.