Niklas Tarnat scored the only goal of the match as Bayern Munich edged a narrow victory over Reading at Adams Park.
The son of former Bayern star Michael Tarnat struck from 12 yards with 11 minutes played after Maxime Awoudja had surged forward and set him up with a defence-splitting pass.
Although Danny Loader had the ball in the net for Scott Marshall's side early in the second half, his goal was ruled out for offside.
Bayern held on for a victory that lifts them to third place in Group E, level with Porto in second, and a point behind leaders Arsenal, with a match in hand.
Reading are fourth with a point.
See: Reading report
Next fixtures
Reading: 11 Dec v Blackburn (A)
Bayern: 23 Jan v Arsenal (A)