Arsenal's hopes of qualifying for the quarter-finals remain firmly in their own hands following a goalless draw with Reading at Boreham Wood.
Royals goalkeeper George Legg denied Eddie Nketiah, Chuba Akpom and Reiss Nelson, while Matt Macey saved from Danny Loader at the other end.
Nketiah also had a late effort ruled out for offiside.
The Gunners top Group E on four points. They, along with Porto and Reading, all face Bayern Munich in their final match.
Arsenal will secure qualification to the quarter-finals if they beat Bayern Munich or if they at least equal Porto's result against the German side.
Reading also need to beat Bayern, but if they do other results will determine their fate.
See: Arsenal report
Next fixtures
Arsenal: 10 Dec v Man City (A) PL2
Reading: 8 Dec v Bayern Munich (A) PL International Cup