5 things to know as Uefa Champions League last 16 starts with PSG v Liverpool, Madrid derby
Plenty of talking points as we reach the knockout round, such as why new Aston Villa man Marcus Rashford must be careful against Club Brugge

The Uefa Champions League knockout stages are upon us, with matches on Tuesday and Wednesday, European time.
On paper there aren’t too many differences with previous editions, despite the traditional group stage having been replaced by a new league phase.
We’re down to 16 teams, with a home-and-away fixture and the winner qualifying for the quarter-finals.
And while the format is roughly the same, there are some caveats, as well as plenty of interesting narrative points.
One nation

For the first time at this stage, teams from the same country can face each other – and that has brought us two particularly intriguing ties.