Multiple Group One-winning rider Pat Smullen has announced his retirement from the saddle.

Smullen, 41, was diagnosed with pancreatic cancer in March last year and has been undergoing treatment.

While his progress remains positive, he said in his weekly column for thoroughbreddailynews.com: "I have had a frank discussion with my doctors and I gave them the full details of the way of life of a jockey, and what I'd have to go through to get back to full fitness, to get back to the weight that I need to be, and to compete at the level I want to compete at.

"They advised me that I should not compromise my immune system in any way. So, taking that into account, the right thing for me to do is to call it a day.

"I've been very fortunate through my career to meet some great people and to ride some very good horses.

"I have a lot of cherished memories of a great career, and I'm very thankful for that. Now it's the second chapter of my life. I think everyone has gathered by now that horses are everything in my life.

"I know nothing else and I'm determined that I'll still work within the industry and, hopefully, I can be of some benefit."