Although the Baggies have struggled overall this season and are currently 16th in the Barclays Premier League, just three points above the relegation zone, they have a decent record against the clubs that presently make up the top seven.
Mulumbu told the WBA website: "We've done well against the big teams this season, and on Wednesday we saw Sunderland draw against City.
"So anything is possible in football, especially in England. It's like a cup game. You never know what's going to happen.
"We just need to go there and start well, start sharp like we did last Saturday against Tottenham and show a little bit more strength at the end of the game."
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