The Hammers have just eight points from 13 away games all season and have lost their last five away matches in the Barclays Premier League.
Assistant manager Neil McDonald hopes United, who last picked up a point on the road in the December draw at West Brom and most recently claimed three in the win at Newcastle in mid-November, can improve their record of three wins in 18 matches tomorrow and draw level on points with opponents Stoke.
"It's a stern test," said McDonald, who assumed manager Sam Allardyce's pre-match media duties.
"I think they're very well organised. They're quite direct with the way they play, into the forwards, then knocking it down and getting it wide.
"We have to deal with crosses, we have to deal with knock downs as well.
"Hopefully with our game and our game plan we can give them a little bit of a test as well.
"We're looking forward to the game and we're trying to put right what we haven't done over the last four or five away games."
- Sports & Recreation