West Ham manager Slaven Bilic
West Ham United have been linked with a host of top strikers this summer but have already missed out on Dutch star Vincent Janssen after he opted to join Spurs, as well as Lyon's Alexandre Lacazette despite having a record £31 million bid accepted.
Hammers boss Slaven Bilic also failed with a bid to lure Belgian star Michy Batshuayi who instead joined London rivals Chelsea.
Meanwhile, a rumoured move for Liverpool's Christian Benteke and talk of bids for Juventus duo Simone Zaza and Mario Mandzukic have gone quiet.
AC Milan's Carlos Bacca is West Ham's marquee signing target
Swansea City's Andre Ayew and his brother Jordan at Aston Villa are targets but West Ham have made it clear they are in the market for at least two strikers and maybe more given the likely departures of Diafra Sakho and Enner Valencia.
Everton's Oumar Niasse has played just 152 minutes for the Toffees
Is Everton striker's number up?
The 26-year-old Senegal striker joined the Toffees from Lokomotiv Moscow for £13.5m in January but has failed to score in just 152 minutes on the pitch for the club's first team.
Niasse has not been given a squad shirt number this summer and has also been frozen out of Everton's pre-season fixtures, as reported by the BBC.
Diafra Sakho celebrates scoring for West Ham at Goodison Park last season
A Roberto Martinez signing, Niasse's future clearly lies elsewhere, and Everton will be keen to cut their losses on him.
With West Ham set to lose their own Senegal striker if Sakho does join West Bromwich Albion, they might be able to replace him relatively cheaply with a striker hungry to prove himself after an inauspicious start to life in the Premier League.