Barcelona superstar Lionel Messi is set to welcome another son into his family after he, along with wife Antonela Roccuzzo, revealed they are expecting a baby boy.

Roccuzzo took to Instagram last month to announce to the world she was pregnant with her third child, posting a picture of showing herself, Messi and their two sons touching her stomach alongside the caption: ‘Family of 5. Blessed.’

This week she appeared to announce to the world that their next child would be a boy after posting a birthday celebration for their eldest son Thiago, who recently turned five.

Leaving a touching message on Instagram to mark his fifth birthday, Roccuzzo wrote in Spanish: ‘Happy Birthday Thiagui. Five years old. How big you are my love. I hope you’re always this happy.

Finishing off the message as a caption for the image of Thiago on a swing, she added the long hashtag – referring to the couple’s other son Mateo as Matu: #papimamimatuytuhnitoencamino #nopodemosamartemas.

The hashtag sentence in Spanish translates into English as ‘Daddy and Mummy, Matu And Your Little Brother on the way, we cannot possibly love you any more.’

Media in Messi’s native Argentina immediately jumped upon this as a sign their majestic No 10 would soon be welcoming another young son into the world.

Roccuzzo used the shortened form of the word ‘Hermanito’ – Little Brother – at the end of the message rather than Hermanita, meaning Little Sister.

It has been a busy year for the couple, who married in their hometown of Rosario in Argentina back in June.

The entire Barcelona squad turned out for the ceremony, with Messi accompanied by his striking duo Luis Suarez and Neymar, before the latter completed his world record move to PSG.

Messi has been in inspired form for Barca this season and currently leads the scoring stakes in La Liga.

The Argentine maestro has 12 goals from 10 games played so far this season, with Barca sitting four points clear at the top of the table with 28.