The new deal will keep the 24-year-old at the club until 2013.
“I’m an Adelaide boy so there’s no other team I want to play for, and I’m really happy to be staying at Adelaide United,” Cornthwaite said.
“As soon as I heard that the club wanted to re-sign me I was really happy and we went through the negotiations, which went really smoothly, so I’m very happy to be staying here.”
