The Baggies have the fourth best defensive record in the Premier League having conceded six goals in their opening eight fixtures, with Olsson hailing his side's strength and solidity at the back.
"It is three clean sheets and not a lot of goals conceded from open play," he told the club's official website. "We feel solid and I think we've been solid now for a few years.
"Our shape is good. Even though we didn't put our chances away on Saturday, we felt solid and the point was never in doubt, so that's a strength.
"Overall, we are heading in the right direction. We're five games unbeaten and we'd like to keep that run going."
West Brom visit Liverpool in the Premier League on Saturday.