Chicago Fire Season 11 spoilers: Casey is returning! Here's how?

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Chicago Fire season 11 premiere set-up Matthew Casey's return to the series. 

After working for a decade at Firehouse 51, Casey made the difficult decision to leave, relocating to Portland 

However, given his relationship with Sylvie Brett, he will surely return

But when? In season 11?  Swipe Up To Know The Shocking Spoilers