4-leg acca

Real Madrid travel to Athens to face AEK at the OPAP Arena, and the gulf in European pedigree makes the visitors the sensible selection over ninety minutes. Arsenal head to the Fortuna Arena in Prague, where Slavia have made life awkward for bigger names before, but the Londoners' squad depth should tell against Czech opposition. Viking host Sabah in Stavanger, and with the visitors facing a long journey north, the home side's ground advantage is the angle. Finally, Borussia Dortmund meet Real Betis at Signal Iduna Park, where covering Dortmund or the draw provides insurance against a stubborn Spanish outfit. Viking is the leg we trust least: the case rests almost entirely on home advantage against opponents whose true level at this stage is difficult to gauge from the sheet alone.