Canon Pixma TS3722 printer compatibility with MacBook Pro OS X El Capitan 10.11.6

Canon has supporting software for OS X 10.11 El Capitan, but no specific printer drivers.

https://www.csai.canon.com/support/p/pixma-ts3722-wireless-home-all-in-one-printer

(DOWNLOADS -> Software & Drivers -> 1. Mac -> 2. OS X El Capitan v10.11 -> 3.)

However, the Canon TS3722 is listed as a supported AirPrint printer.

About AirPrint - Apple Support

An AirPrint model can be used without additional drivers, provided that the printer and the Mac are connected to the same network (Wi-Fi router). This ought to work even under El Capitan, so you may want to test it.

If your router supports WPS, a simplified Wi-Fi connection method could be used.

https://support.usa.canon.com/kb/s/article/ART184700

https://www.canon.co.uk/support/consumer_products/apple_airprint_guide/

Add a printer on Mac – Apple Support (UK)

well if you go to their site and choose that macos version it does display drivers to download

Canon Support for PIXMA TS3722 | Canon U.S.A., Inc.