Villa were at their best against Tottenham in London, defeating the Europa League hopefuls 2-1.
Grealish managed 73 minutes in what was his first start for over three months, with Ollie Watkins netting the winner for Villa.
Smith said post-game, per the Express and Star: "You could see having Jack back gives everyone a lot of confidence. We created a number of chances.
"I think over the last couple of weeks he has been a little bit tentative compared to the normal Jack Grealish, which is understandable.
"Tonight I thought he exuded confidence. He looked assured. He wanted me to keep him on and I managed to get 12 minutes extra than the medical staff wanted. I have no doubts he will want to start against Chelsea on Sunday."
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