The Hammers have already been beaten twice by Bolton this season and Alan Pardew admits that tie is a “tough draw”.
He told the official site, “We've already crossed swords with Bolton twice this season, so both teams know each other well and it will be nothing less than a really tight game.
“However, our good position in the Premiership is a platform for us to really have a go at the FA Cup, and we will go up to Bolton feeling confident.
“The other good thing is that we will get a big allocation of tickets, and I'm sure our fans will travel up there in their masses and make a lot of noise. That will certainly inspire us, but we're already determined to progress to the quarter-finals.”