A large-scale safety operation will be deployed around the match involving 3,000 security personnel while both teams have been instructed to travel to the stadium from the same hotel.
"They are the champions, they have all the assets to be called the best team in Europe. We will have to use all our hard work and our experience.
The board of CSA met on Monday and seemingly again resisted calls to resign. Three of the original 12 directors have resigned in the past two weeks. The only announcement following Monday's meeting was about Richardson's appointment.
The Portuguese has been the opposing manager scheming against the club he led to three Premier League titles during spells with Inter Milan and Manchester United.
Barcelona will play Napoli for the first time as the Catalan giants, five-time European champions, attempt to move on from last season's painful semifinal loss to Liverpool.
"I'm currently living in the best period of my life, with the best people around me. I really feel like this is very important for my balance and for my thinking," Tsitsipas told reporters in Abu Dhabi, where he is contesting the Mubadala World Tennis Championship exhibition starting Thursday.
Democratic Tsunami, the protest group in favor of Catalan independence, has called publicly for its supporters to gather at the stadium four hours before kickoff at 19:00 GMT.
At the same time, Harry launched an emotional attack on the UK tabloid press for what he called a "ruthless campaign" against his wife.
For Palace, Christian Benteke made his first start since August while Jeffrey Schlupp's hip injury meant Jairo Riedewald came in at left-back and Scott Dann also came in.
"You see many fresh faces and I think we're only going to get better from here."
France forward Mbappe took his league tally to nine in 11 appearances as his side took advantage of second-placed Marseille only drawing at Metz on Saturday to move seven points clear and tighten their grip on the French championship, which they have won six out of the last seven seasons.
Both teams have found form in recent weeks, in part due to the excellent form of their strikers. Madrid's Karim Benzema has nine goals in his last eight games while Lionel Messi has scored 14 in 12.
Tsitsipas' best Grand Slam result to date was reaching the semifinals of the Australian Open last January.
Another side who were fourth on Christmas Day, it was 2003-04 for Saints, but they have been down since. Formed into a solid Premier League side who developed then sold academy players under Pohcettino, they are flirting with relegation this season.