Subaru Park will be abuzz Tuesday when the Union take on superstar Lionel Messi and Inter Miami in the semifinals of Leagues Cup.
"This is the biggest game that our stadium has ever had," Union head coach Jim Curtin said Sunday to NBC Sports Philadelphia.
The match starts at 7 p.m. ET and can be watched on Apple TV+. Tickets were sold out by Saturday afternoon for the venue in Chester, Pennsylvania.
Messi and company arrived to Philadelphia on Monday afternoon.
"To have Lionel Messi here in a semifinal, an elimination game," Curtin said, "is something that's incredible for the city."
Messi, one of the greatest players in the history of the sport, has eight goals through five games of Leagues Cup action with Inter Miami.
The Union haven't lost since a July 8 MLS matchup with the Galaxy.