"We owe Plymouth," Westwood told the Coventry Telegraph. "They spanked us 4-0 last year but we are in a different place now. At that time we were playing for nothing and we weren't really doing it, but we are in a different zone now and we need points as well as they do.
"It should be end-to-end but we are going there in high spirits. We desperately needed a win on Saturday and we got it, albeit hanging on in the end, and we know we have to build on that now."
Westwood played down rumours that manager Chris Coleman's job is on the line.
"We are all behind the gaffer," he said. "He does a great job and any talk of him being sacked is way out of the question."