Rovers have only lost three of 12 league games since Sam Allardyce (pictured) took charge.
March 21, 2009 Kick off: 15:00
Blackburn have managed just one win in eight hosting opposition from London in the Premier League.
Since Sam Allardyce's arrival, visitors to Ewood Park in the league have either scored twice or failed to find the net.
West Ham have only lost one of their last nine Premier League away matches.
Rovers have picked up the most cards this season - 61 yellows and three reds.
The Hammers have kept five clean sheets in their last seven league games and in the last three games in a row.
Gianfranco Zola's side have only scored three goals in their last six Premier League matches.
