There are four RB Leipzig players in Euro 2016, and you will find three of them in this match: Stefan Ilsanker and Marcel Sabitzer on the Austrian side; Peter Gulacsi with the Hungarians.
What those three players have in common is not so much Leipzig as Salzburg: all three moved from Papa Red Bull's Austrian club to Brother Leipzig last summer (Sabitzer was loaned out to Salzburg for a season after being signed by Leipzig in 2014), but all three made significant contributions to Ralf Rangnick's Bundesliga-bound squad this year. 'Keeper Gulacsi made 14 appearances in 2. Bundesliga for RB Leipzig in the 2015-16 campaign; midfielder Ilsanker played in 26 league games (racking up an impressive 10 yellow cards along the way); Sabitzer, a winger with an eye for goal, made 32 appearances in the league and scored eight goals.
What they also have in common is that they probably won't be starting this match. For Hungary, 40-year-old Gabor Kiraly is the established starting 'keeper, not Gulacsi. For Austria, Ilsanker and Sabitzer both made regular appearances in qualifying for this tournament - but typically off the bench.
For some observers, Euro 2016 could be a break-out moment for the 22-year-old Sabitzer, who was getting big club attention before he opted to join Ralf Rangnick's Red Bull revolution in 2014.
Unsurprisingly, given the club's dominance of Austria's Bundesliga in recent years, there is a strong RB Salzburg contingent in Marcel Koller's squad for Euro 2016. Surprisingly, there aren't any current Salzburg players in Austria's 23.
Martin Hinteregger is still technically a Salzburg man - but he was loaned out to Borussia Monchengladbach for the latter half of this season, and is now rumored to have caught the attention of Sunderland.
Salzburg's influence is peppered throughout the Austria squad in the form of ex-players. Reserve 'keeper Ramazan Ozcan spent a couple of seasons as back-up in Salzburg before moving to play for Rangnick's Hoffenheim in 2008; more recently, he played under Ralph Hassenhuttl (now the RB Leipzig head coach) at FC Ingolstadt, and has just joined Bayer Leverkusen (coached by former RB Salzburg head coach Roger Schmidt).
Defender Florian Klein spent two seasons with Salzburg before moving to current club Stuttgart in 2014. Forward Jakob Jantscher joined Papa's Austrian outfit in 2010, won the league and cup double in 2012, and then moved on. Star striker Marc Janko had five seasons in Salzburg, establishing his name at club and international levels, and has since played top flight soccer in five different countries (the Netherlands, Portugal, Turkey, Australia, and - currently - Switzerland) over the past six seasons.
Almost one third of the squad (seven of the 23) has passed through RB Salzburg's ranks over the last 10 years or so. Of that group, only Klein and Janko were regular starters during Austria's impressive Euro 2016 qualifying campaign, in which the team won nine of 10 games (and drew the other) and beat Russia and Sweden on their respective home soils in the process.
Austria's form since has been less convincing (friendly losses to Switzerland, Turkey, and the Netherlands; wins over Malta and Albania), but an opening match against possibly the weakest team in Group F is an opportunity to build early momentum.
This will be the 137th iteration of an international soccer rivalry that started in 1902, though this is the first time these teams have met since 2006.
MLS fans will likely remember Hungary's Krisztian Nemeth, who spent a successful 2015 with Sporting Kansas City before joining Qatari club Al-Gharafa. But Once A Metro will be cheering on the Red Bull connection on the Austrian side of the field.
Update: Janko and Nemeth are both fitness concerns for their respective coaches.
Krisztian Nemeth is a doubt for #HUN [muscular injury] . The forward has been side-lined for the past two-months and lacks match-fitness.— Ben Dinnery (@BenDinnery) June 14, 2016