"Every player evolves after a confident year like he had at Bolton when he was scoring goals week in and week out," said Andre Villa-Boas, according to reports in the Guardian.
"And that's why we thought he had the qualities to be part of the Chelsea squad. In the end the decision proved right for Daniel."
Sturridge's chances have improved after the suspension of Fernando Torres.
The Chelsea boss revealed: "We have been using Daniel on the right, coming inside," he added. "Normally they are not competing for the same position and I have spoken to him about this and he is happy in that position as well.
"I think it favours his natural and technical abilities and his pace so he is competing for right and left winger positions."
However, Villa-Boas was cautious about pushing the 22-year-old for England.
"He hasn't been called up yet for England," he said. "I think at the moment he is focused on competing for his place and bidding for the titles we want to win. It's not my choice if he gets called up.
"It could be good [for us] but that's a decision for the England manager to take. And if he thinks Daniel can add to his squad, I'm sure he won't hesitate over the decision", the Portuguese concluded.