Chelsea have announced an additional game against Manchester City in the United States as part of their end-of-season tour.
City and Chelsea will first meet at Busch Stadium, home of the St Louis Cardinals, on 23 May, before a second game at Yankee Stadium in New York two days later.
Chelsea chief executive Ron Gourlay said: "The club is excited to be playing a double-header in the US this May and thrilled to be returning to Yankee Stadium.
"We were delighted to take part in the first-ever football game there, and we received sensational support in what was a sea of blue fans inside and outside the stadium that day.
"Spending the week in St Louis and New York also provides a great opportunity for the club to reconnect with our US fans before we head to Asia in July for pre-season.
"America has long been an important place for Chelsea Football Club, and we have seen first-hand the continued rise of the game's popularity."
All tickets for the St Louis friendly at the 46,861-capacity Busch Stadium sold out within 20 minutes of going on sale.