Exciting Cronulla youngster Valentine Holmes, with just one NRL match under his belt, has extended his contract with the Sharks through until the end of the 2017 season.

The 19-year-old Holmes, able to play fullback or wing, showed great potential in his NRL debut last weekend, having a hand in both Sharks' tries in the 32-12 loss to Parramatta.

Added to the team at late notice when Sosaia Feki was ruled out at the final training session, Holmes' running game was a feature and, with the season-ending injury to Jacob Gagan, he has again been selected in the top-flight squad for Sunday's away clash with the Warriors.

Already contracted for next season, Holmes has extended his commitment to the Sharks for a further two years.

Coach James Shepherd, responsible for recruiting Holmes to the Sharks before coaching him at NYC level last year, sees an exciting future ahead.

"Valentine has great potential and has been rewarded for his good performances with this new contract," Shepherd said. "He has plenty of talent and, if he takes this opportunity and works hard, I have no doubt he can become a quality first-grade player for many years to come."

After signing his new contract on Wednesday, Holmes said he was thrilled to have secured the new deal.

"I'm excited about this opportunity," Holmes said. "I'm looking forward to working hard and making the most of the next three years here at the Sharks."

Originally from Townsville, Holmes joined the Sharks in 2013 and, after playing for the under-18 SG Ball side, was promoted into the under-20s Holden Cup squad later in the year.

He went on to be one of the standout performers for Cronulla's under-20s throughout 2013 and has been in similar form this year.

Also in 2013, Holmes represented Queensland under-18s and was a member of the Queensland under-20s State of Origin side who played NSW in May.