Five Champions League play-off round matches to keep an eye on

While European league seasons are now getting under way, the continent's showpiece tournament, the Champions League, kicked off months ago: in fact, two days after Spain beat Italy in the Euro 2012 final.

The big winners in the first qualifying round were Luxembourg's Dudelange (7-0 winners over Tre Penne) and Malta's Valletta (8-0 against Lusitans).

Both have since been eliminated and this week sees some fascinating match-ups in the play-off round, with the winners reaching the holy grail -- and cash cow -- of the group stage.

Here are five matches worth keeping an eye on: