The Welshman damaged ankle ligaments and had two hernia operations during his first year at the Stadium of Light after joining from Blackpool.
However, he has now underlined his desire to put those difficulties behind him, telling BBC Newcastle: "I had a few injuries that hampered my season and interrupted the flow.
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Vaughan featured in his first match of the season for Sunderland’s reserve side in a 2-2 draw with Newcastle on Tuesday as one of three permitted players over the age of 21.
"We had some good chances, their goalkeeper has made a couple of saves and we had some poor finishing," Vaughan continued.
"But it was a good job it was a reserve game and we can learn from our mistakes.
"On the balance of the game, we felt we could have won it and we had quite a few chances in the second half but 2-2 was probably a fair result."