Albion are the least fancied side of the four play-off contenders with the bookmakers – including Norwich, who finished below them.
“I don’t think it’s a bad thing,” Albion keeper Alex Palmer told BBC Radio WM.
“People were writing us off earlier in the season before we were really in the play-off places.
“So now we just go about our business. Whether it’s under the radar or people have got different odds against us, then so be it.
“We’re fully-focused on ourselves and putting in the strongest performance on Sunday.”
Palmer was merely an interested onlooker – third choice after Sam Johnstone and Jonathan Bond – the last time Albion made the play-offs five years ago, when they narrowly lost to neighbours Aston Villa, the eventual winners.
“I remember the Villa game, when we were last in the play-offs at home,” Palmer added.
“It was one of the best atmospheres I’ve felt. I remember watching from the gantry and it was incredible.”
Palmer, who kept 18 clean sheets this season to share the Championship Golden Glove award with Leeds’ Illan Meslier, also has previous play-off experience.
His Lincoln City side lost to Blackpool in the League One play-off final in front of only 10,000 fans at Wembley in the first post-Covid pandemic final in 2020-21.
After an uplifting season at the Baggies, in which they were taken over by new owners, Albion have a renewed feeling of terrace support to draw on from their fans.
And they can point to a decent home record, having won 15 and lost only four of their 23 home games this season. But Saints have also won 15 home games – and Martin’s team also have the better away form, having won 11 times on the road.
But what could also be a telling factor is experience – and the Baggies have that.
Compared to the other three teams, Albion have the most experienced group of players when it comes to the play-offs – and Corberan reached the final two years ago with now relegated Huddersfield Town.
