West Ham must up their bid to sign Napoli striker Arek Milik.

The Hammers are said to have bid £6.3million for the Poland superstar as David Moyes targets a replacement for Sebastien Haller, says The Sun.

And Napoli are keen to offload the 26-year-old this month with his contract set to expire in the summer.

Milik is yet to feature for the Italian outfit this term having been omitted from Gennaro Gattuso's Serie A and Europa League squads.

But Napoli are holding firm in their valuation of the ex-Ajax ace as they seek a fee in the region of £8million.

Italian journalist Ciro Venerato has stated Milik could end up at the London Stadium, but only if they improve their bid.

Quoted by Spazio Napoli, he said: "Milik can go to Marseille, the French side are a club where the Pole can land. Napoli continue to ask for more than €9m (£8m) and there's also a problem with the percentage of resale.

"There's also a chance he'll go to West Ham, a chance offered by the agent."