Brisbane have upgraded youngster Xavier Coates' contract.

The 18-year-old has signed a new deal with the club, keeping him in Broncos colours until the end of 2021.

The centre was named in the Broncos squad on Tuesday and is set to make his NRL debut this weekend against the Sharks.

Broncos coach Anthony Seibold told the club website: “Xavier is a really talented young man and it’s great to have his future secured here at the Broncos.

Coates had a man of the mach performance for the Queensland Under 18's last month, in a 34-12 win over New South Wales.