Tony Mowbray hopes West Brom's new central defensive partnership of Jonas Olsson and Shelton Martis will cut out the soft goals which have left the Baggies struggling for Barclays Premier League survival.
Olsson and debutant Martis appeared together for the first time at West Ham on Monday as Albion earned a goalless draw after conceding 17 goals in the previous six league games.
Mowbray said: "After the clean sheet at Upton Park, I would suggest Jonas and Shelton have to be the men in possession of the places."
Now West Brom have back-to-back home games with Bolton - on Saturday - and Stoke which will be pivotal to their chances of staying in the top flight.
Mowbray added: "As we have found out in the past, they must concentrate 100 per cent for 90 minutes and not give soft goals away.
"Teams in the Premier League will score goals against us because they have got top strikers but what has frustrated and disappointed me for the past few months is a lot of the goals conceded have been of our own making.
"They have been down to lapses in concentration and our failure to to defend certain situations.
"I go and watch loads of games in the Premier League and I see defenders doing their jobs, heading and defending, putting their foot in, putting the ball in the right areas.
"We haven't been able to do that recently but on Monday at West Ham we did. Now we need to build on that."
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