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Lionel Messi AND Cristiano Ronaldo renew some of their favourite rivalries, a game-changing revamp of the rules, and a real test for Liverpool... why we can't wait for the Champions League to return TONIGHT

The Champions League, finally, is back this week in a move that signals the season ramping up into the business end of the campaign.

Europe's elite cross paths once again with the first half of the last-16 ties taking place this week and the others getting underway next week.

Sportsmail looks at some of the major talking points ahead of kick-off tonight.

Chelsea's defence of their Champions League title continues against Lille in the last-16

MESSI AND MBAPPE TAKE ON MADRID

In his pomp at Barcelona, Lionel Messi often shone brightest in Barcelona's fierce Clasico clashes with bitter foes Real Madrid.

This week he reignites that rivalry, but this time in the colours of PSG following his jaw-dropping departure from the Nou Camp last summer.