The Beverly Hills, 90210 star was filming the upcoming drama in Toronto, Canada on Monday (09Nov15) when he fell from his horse and was admitted to a local hospital for treatment.

He remained under doctors' care overnight as a precaution and was discharged on Tuesday (10Nov15).

Production on the show has been temporarily shut down to allow Priestley time to recover, but he has reached out to fans on to assure them he is "on the mend".

"Hey guys, thanks for all the kind words...," the 46 year old writes on Wednesday (11Nov15). "It's true, I did get thrown off a horse on set... I got my bell rung pretty good (sic)... Because I have a history of concussions, they took me to see a neurologist for an assessment. He advised I take a few days off as I had suffered a Concussion... But I am definitely on the mend and looking forward to getting back to work with all the wonderful people on The Code."

The project, in which Priestley plays a former ice hockey professional-turned-private investigator, is based on the book of the same name by G.B. Joyce. The programme is expected to premiere next year (16).

The Canadian is no stranger to health scares - in 2002, he suffered a head injury, fractured spine, broken nose and fractured feet after crashing his car at the Indy Racing Infiniti Pro Series at the Kentucky Speedway.