Former Arsenal star Charlie Nicholas is backing League One club Peterborough United to cause an upset by defeating West Bromwich Albion in the FA Cup fourth-round replay.

The Baggies will travel to London Road for the fixture on Wednesday evening, and Nicholas believes that Graham Westley's Peterborough will win the tie 2-1.

The Sky Sports pundit writes in his pre-match analysis column: "If there's a Premier League team in danger right now, then it's West Brom. Crystal Palace are getting mentioned like Watford were a few weeks ago, but it's West Brom who are in danger right now.

"The crowd don't like the style Tony Pulis has them playing and now the results are failing, they have the right to question it.

"You see Saido Berahino sat on the bench and he's clearly not match fit, but that's because he's not starting games. Salomon Rondon looks nowhere close to a £12m signing and you still keep looking at Berahino to score the goals they need.

"Darren Fletcher has been the one good player, but maybe he's hitting fatigue. The other seemingly reliable players seem to be making questionable decisions at the moment.

"There's a great incentive for Peterborough and they always score goals, just one less than League 1's leading scorers, and London Road, which always has a great atmosphere, will be rocking.

"West Brom just don't do well in the cup competitions, they won't prioritise this game because of their league troubles and I can see the Posh prevailing."

The winning side will travel to the Madejski Stadium to take on Championship club Reading in the fifth round of the cup.