Barca have new boss Ernesto Valverde guiding them through their preparations for the 2017-18 season, while Juve have been rocked by the departure of star defender Leonardo Bonucci to Serie A rivals Milan.
Both clubs have plenty of work to do, then, to make it back to European football's biggest game in the coming campaign and will hope to learn a few lessons at the MetLife Stadium in New Jersey.
|Game||Juventus vs Barcelona|
|Date||Saturday, July 22|
|Time||18:00 (local) / 23:00 BST|
TV CHANNEL & LIVE STREAM
In the UK, the match will be available to watch live on television on Premier Sports and by stream via the Premier Player app.
|UK TV channel||Online stream|
|Premier Sports||Premier Player|
In the US, the match will be available to watch live on television on ESPN and in Spanish on ESPN Deportes. It can also be streamed on WatchESPN.
|US TV channel||Online stream|
|ESPN / ESPN Deportes (Spanish)||WatchESPN|
SQUADS & TEAM NEWS
|Goalkeepers||Buffon, Szczesny, Pinsoglio, Del Favero|
|Defenders||Alex Sandro, Barzagli, Benatia, Chiellini, Coccolo, De Sciglio, Lichtsteiner|
|Midfielders||Asamoah, Bentancur, Caligara, Khedira, Lemina, Mandragora, Marchisio, Pjanic, Rincon, Sturaro|
|Forwards||Cuadrado, Douglas Costa, Dybala, Higuain, Kean, Mandzukic|
Juventus will have new signings Mattia De Sciglio, Douglas Costa, Rodrigo Bentancur and Wojciech Szczesny in their squad, but Leonardo Bonucci and Dani Alves have departed.
Potential starting XI: Buffon; De Sciglio, Barzagli, Chiellini, Alex Sandro; Pjanic, Khedira; Cuadrado, Dybala, Mandzukic; Higuain.
|Defenders||Pique, Alba, Digne, Umtiti, Vidal, Marlon, Douglas, Vermaelen, Cucurella, Palencia|
|Midfielders||Busquets, Mascherano, Iniesta, Rakitic, Rafinha, Arda, D. Suarez, Roberto, Samper, Alena|
|Forwards||Messi, Neymar, L. Suarez, Alcacer, Munir, Deulofeu|
Barcelona have brought a near-enough full-strength squad to the USA, with Marc-Andre ter Stegen and Andre Gomes the only absentees after playing at the Confederations Cup.
Neymar looks set to be involved despite speculation linking him with a move to Paris Saint-Germain.
Potential starting XI: Cillessen; Roberto, Pique, Umtiti, Alba; Rakitic, Busquets, Iniesta; Messi, L. Suarez, Neymar.
Barcelona are 5/4 favourites to win, according to dabblebet, with Juventus priced at 2/1 and the draw available at 12/5.
Two of Europe's biggest clubs find themselves facing potentially defining moments in their 2017-18 season before they have kicked a ball. They even, in some ways, have the same two choices in terms of solving their problem.
On the Juventus side, Leonardo Bonucci is gone. So is Dani Alves and, 12 months earlier, Paul Pogba. Douglas Costa, Mattia De Sciglio and Wojciech Szczesny have been signed so far this summer but two of those players will most likely be backups.
The question is this: do Juventus now go out and do another deal of the type that brought Gonzalo Higuain to Turin? Or do they ask the likes of Daniele Rugani to step up, continue their pursuit of another young Italian in Federico Bernardeschi and play the long game?
For Barcelona, the situation is even more serious. They have been plunged into a crisis by speculation suggesting Neymar is ready to quit the club for Paris Saint-Germain, who could sign him by paying his €222 million release clause.
Barca would certainly spend big if Neymar was to leave but, like Juventus, would have to decide whether they want to hunt down Real Madrid next season or set themselves up for the longer term by signing a talent or two such as Kylian Mbappe or Ousmane Dembele.
Realistically clubs such as these two will always be expected to do both; to win now and nurture a pipeline of prospects. With Madrid as strong as ever and the top Premier League sides rolling in cash, neither can afford to get their next step wrong.