Sky Sports News understands that West Ham have entered the race to sign Portsmouth captain Marc Wilson.
The 23-year-old defender is subject to interest from a number of top-flight sides, with West Brom having already had a £3million bid turned down.
Fulham are also keen, while Stoke are thought to be lining up a player-plus-cash deal for the defender - with Dave Kitson and Liam Lawrence discussing moves in the opposite direction - estimated to be worth around £3.5m.
But Avram Grant's West Ham have now also made an approach, as they are eager to shore up a leaky defence which has already conceded six goals in their opening two Premier League defeats.
Pompey boss Steve Cotterill previously admitting he would be powerless to prevent Wilson leaving Fratton Park if the club receive the right offer.