The Hammers, who scored two fewer goals than relegated Wigan last season, have drawn a blank in their last two Premier League games of 2013-14, drawing with Newcastle and losing 1-0 to Stoke City, having opened the campaign with a 2-0 victory over newly promoted Cardiff City.
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"I'm looking for us to give the kind of performance we gave at Newcastle and this time be more clinical," he told the club's official website.
"We've gone two games without scoring a goal now, which is something I don't like, even though we've been very good defensively.
"We need to be putting the ball in the back of the net more, so, when a chance comes along at Southampton, we must take it.
"We must perform to the level we did at Newcastle and take our chances because, if we don't, it will be a very tough game because we've seen the improvement they've made."