John Morris has taken to social media to proclaim he is ready to step up in banned coach Shane Flanagan's absence to guide Cronulla in the 2019 Telstra Premiership.

The former Shark, who finished with 300 first-grade games in his career which also included stints with Newcastle, Parramatta and the Wests Tigers, posted a photo from his final match in 2014 in his Instagram post.

"This was the last time I pulled on a jumper for my beloved Cronulla Sharks," he wrote.

"Running out with my 2 Boys in my 300th NRL game was the pinnacle of my playing career. Today I commence a new journey after being named Interim Head Coach of the @cronullasharks.

"To say I am proud and honoured to be given this opportunity is an understatement. Thanks for everyone's msgs of support over the last 24 hours.

"I can not wait to rip into our preparation for the 2019 season and lead a fine group of players and staff #UpUpCronulla."

Morris was named interim head coach on Thursday with Jim Dymock to remain as an assistant coach after last month the Sharks announced they would be co-coaches in the wake of Flanagan's indefinite ban for breaching the conditions of his previous suspension following Cronulla's peptide scandal.