The Belgium international was outstanding in the shock win on Saturday.
"I feel good," Defour told HLN. "This was an incredible match. I had a good preseason and you can see that. I'm physically sharp. I have also shown this. Even in my substitution there was still a spare in the tank. Nice.
"I didn't want to have a year like last season."
Clarets boss Sean Dyche added: "He looks good. I do not give any guarantees, but he looks more settled, better adapted, he seems better to handle the pace and understands our game a lot more."