Chelsea England players in early return
Midfielder Frank Lampard, left-back Ashley Cole and Cahill on Monday travelled to St Louis with Rafael Benitez's Europa League-winning squad and will be available for Thursday's friendly with City before returning to London to join up with England.
Cahill said on chelseafc.com: "We will train for the next couple of days and will be involved in the game on Thursday and then fly back on Friday."
The United States trip, which features a second friendly with City on Saturday in New York, comes at the end of Chelsea's 69-match season which saw them finish third in the Barclays Premier League and ahead of England matches with the Republic of Ireland and in Brazil.
"It's not stopped yet," added Cahill, who was absent for England duty in March with a knee injury.
"I finish totally on June 3 I think. I'm looking forward to the internationals because I missed the last ones with injury, but then looking forward to a rest at the end of what's been a long season."
Cahill reflected on a successful end to another tumultuous season at Stamford Bridge.
"I think you have to say we finished strongly," he said.
"We got the third position we were aiming for and achieved what we wanted there, and we finished with a trophy.
"We had ups and downs but like last year we finished well and we can be pleased."
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