The German World Cup winner, who was previously a Chelsea player, left the Blues for Wolfsburg in 2015 and has since been playing with Borussia Dortmund.
Following the completion of a two-year loan deal from Dortmund to the Cottagers, however, the 27-year-old told The Sun that he is "really looking forward to the season".
"When I look back, maybe I would change some things. Maybe the move to Germany was too early and I should have stayed at Chelsea a bit longer," Schurrle said. "But like this time, you have options and you either take them or leave them. I took them because I had a good offer at a good club in Germany.
"But the way I felt here in London with the supporters who gave me so much love — that was something I was thinking about when I came back here. The support was amazing.
"I know all the places here, I have friends here. I have all the stuff that I need and I'm really looking forward to the season."
Schurrle won the Premier League title and a League Cup crown while at Chelsea.