West Coast co-captain Oscar Allen has revealed his engagement to longtime girlfriend Lorna McNabb.

The Eagles forward posted the happy news on his Instagram account, simply showing a picture of them smiling and McNabb wearing a dazzling diamond ring.

The post was quickly swamped with well wishers, including one from the new fiancee herself.

“A very special moment that Dad could be part of,” it simply read.

Paul Leaping wished the couple all the best.

“Congratulations guys, so good to see. Wedding season will be busy for the Allens,” he said.

Another commented: “Congratulations Lorna & Oscar .. 🎉🎉Enjoy the celebrations .. ❤️❤️”

Anne Petruccelle said: “Big congrats to you both 🥰”

Family were also quick to congratulate the couple on their big news, with Angus Allen saying: “Love ya both very much🤍🤍”

Lisa McNabb added: “Our fav people 🤍🥂”

Liv Cripps, wife of Eagles goal-sneak Jamie, also joined in the happy moment by sharing a photo of Allen and McNab in a happy embrace with the caption: “Ya big cuties!”

Allen and McNabb have been dating since mid-2019, when the latter was still at the University of WA studying pharmacology.

They were recently seen out celebrating the reopening of Mazzucchelli’s in Westfield Carousel.