This app was mentioned in 4 comments, with an average of 1.75 upvotes
I have it installed on mine. Below is the link to it in the Android App Store. Open on your PC and select to install it to your Chromecast, or go to the Apps tab on your Chromecast and put Fubo in the search box to see if that locates it.
https://play.google.com/store/apps/details?id=tv.fubo.mobile&hl=en_US&gl=US
The app I linked above is specifically for Android TV. There's a separate app for phones and tablets.
https://play.google.com/store/apps/details?id=tv.fubo.mobile