"The romance of the story is definitely not lost on me," Cahill said. "I've always said that if I came back to England, I'd come home. Millwall is where I learnt my trade and it was the most important learning period of my life."
Cahill to play for Millwall to help prepare for World Cup →
"Qualifying for the World Cup has been a great adventure, and it would be a massive honor to represent my country in Russia. That will be my focus in the coming months," Cahill said in a statement.
Tim Cahill leaves A-League, might be headed back overseas →