Barcelona take on Club Leon at Camp Nou in the Joan Gamper Trophy, the traditional curtain-raiser to the start the season.
A whole day choc full of activities for all of the family is book-ended by a festival of football that is always a guaranteed sell-out.
The reason? It's the time when the big guns traditionally return to pre-season action.
A surprise where the latter is concerned because of the nature of the injury sustained in the World Cup. Yet the Brazilian is playing a full part in training with seemingly no ill-effects.
He may not play the full 90 minutes but he is sure to play some part, perhaps just the first 45.
Fully rested after his own World Cup exertions, Messi will relish the chance for some semi-competitive action before the La Liga programme kicks off in just a week's time.
They'll be joined up front by Luis Suarez, a late addition to the team after the decision by the Court of Arbitration for Sport allowed him to train with the squad and partake in any friendlies.
This is the last chance for Luis Enrique to tinker with his line-up, but we are likely to see a first-choice XI for the first half at least.
Sergio Busquets will anchor the midfield allowing the effervescence of Ivan Rakitic and Andres Iniesta to cause problems for the Mexican outfit.
The surging and incisive runs of the Croatian will perfectly complement the trickery and guile of "El Illusionista" and a high quality of pass accuracy will provide an intriguing comparison with Xavi Hernandez, who will also feature.
Helsinki saw firsthand the problems that both will create in the midfield, and those teams wary of the threat posed by Barca's front three would do well to remember just how easily the Blaugrana midfield will carve them open given half the chance.
Jeremy Mathieu and Gerard Pique will start in a new-look central defensive pairing, whilst Jordi Alba and Dani Alves will complete a back four that has height, pace and power aplenty.
Marc-Andre ter Stegen would surely have played but was injured in training and now faces two to three weeks on the sidelines.
Claudio Bravo will start with third-in-line Jordi Masip likely to play the second period. Expected wholesale changes at half-time will see the crowd get to enjoy the silky skills of Alen Halilovic, Munir El Haddadi and more.
Formational variety should be closely watched throughout this one to see if Enrique is brave enough to go with a rumoured 3-2-3-2, per Mundo Deportivo, (via Tom Conn of Inside Spanish Football), or if he sticks with the 4-3-3 template that has generally served the Blaugrana well over the years.
Opponents Club Leon have recently lost talisman and former Barca stalwart Rafa Marquez, who has signed for Hellas Verona, per Sky Sports, (via Fox Sports), however, in a unique twist, his new club are prepared to let the Mexican enjoy a final goodbye at Camp Nou, per Pavel Ibarra Meda of Soccerly.