Former Geelong superstar Gary Ablett and wife Jordan are expecting their third child, announced on social media on Sunday.

Ablett revealed the news in a birthday post for his son, four-year-old Levi, who appeared holding an ultrasound image.

โ€œThe birthday boy wants to share the gift that we as a family have received,โ€ Ablett wrote.

โ€œHappy Birthday my little man, I'm thankful for everyday I get to spend with you.โ€

The Ablett's already have two children, Levi and one-year-old Grace.

Jordan shared a similar message alongside a picture of Levi, who lives with a rare and degenerative disease.

โ€œWe have another gift on the way," the post said.

โ€œHappy birthday to our big four-year-old! You're so loved.โ€