N'Golo Kante was introduced at half-time with the scores tied at 0-0.
The Frenchman scored Chelsea's second as they ran out 3-0 winners, and Azpilicueta believes they could've won by more.
"You know, sometimes changes are needed to change the dynamic of the team," the Spain international told the club's website about Kante's introduction at half-time.
"N'Golo came in, he brought a different energy. We know how N'Golo is [laugh].
"He scored a goal as well, so we're very happy, and I think we could've scored more goals."
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