"His fitness levels are not normal," Wilshere told The Mirror. "He's naturally so fit, he can score at any time in the game.
"If he carries on playing the way he is and working hard, he can improve further. He's got a great appetite for the game. He wants to improve.
"He's training all the time. He's not missing a training session. He's fit, he's young and he's showing his best form."
The victory over the Swans moved secured the Gunners' place at the top of the Premier League.