#3 Let Messi be Messi
"He is incomparable. He’s in a different league." - Johan Cruyff
Seven goals in three matches including two hat-tricks – that's Messi's record at Camp Nou this season in the Champions League. He's scored before the 20th minute in every single one of those matches, and that's exactly what Barcelona would want from him today as well.
Messi is the only Barcelona player to have scored in the first half of a home match in the Champions League this season. This just goes to show how much the Catalan side rely on him.
The Argentine magician has time and again proved that he can single-handedly win matches for Barcelona. But it's essential that he is given that freedom by his team-mates and Enrique, so that he can turn out to be the difference between the teams.
Messi has scored five goals in a single match before – against Bayer Leverkusen in 2012 – and that's the exact number of goals Barcelona need tonight. Not that Messi can score five goals again this evening, but nothing is stopping him from being involved in all of them.