The Republic of Ireland international stopper has impressed during his time with Wednesday and he admits that leaving the Stadium of Light could hardly have worked out any better.
“I had been through a lot going into last summer,” Westwood said. “I was a real crossroads about what I was going to do.
“I had six months out with a shoulder injury and an operation. I was at a crossroads so I needed to make a positive decision. It has turned out to be possibly the best decision I have ever made."
Westwood has recently been named in the PFA's Championship Team of the Season and that is recognition for the form that he has shown at Hillsborough.
The 30-year-old has been a mainstay in the Owls' side and he's played a big part in helping them have one of the best defensive records in the entirety of the second tier.
He is a player Wednesday will look to build their side around for the years ahead and this guarantee of first-team football has clearly delighted Westwood, who had to spend so long on the bench at Sunderland.
Westwood was at Sunderland between 2011 and 2014, but he only made 24 appearances in those three years and it made sense for him to leave when he did.