According to the Daily Mirror, West Ham's bid to sign Argentine playmaker Manuel Lanzini has hit a stumbling block due to paperwork issues.
West Ham had a busy Thursday, beating Maltese side Birkirkara 1-0 in the Europa League, before confirming that midfielder Stewart Downing had been sold back to former club Middlesbrough.
That leaves West Ham with a hole to fill in their squad, and it has become clear in recent weeks that Argentine Lanzini is their top target.
The 22-year-old, formerly of River Plate, is currently playing in the United Arab Emirates with Al Jazira, where he has scored eight goals in 24 games.
The Daily Mail suggested earlier this week that Lanzini was scheduled to have a medical with West Ham ahead of a loan move to Upton Park - but reports are now emerging that the deal has hit a stumbling block.
The Mirror state that the deal is stalling due to a paperwork issue, with Lanzini waiting for clearance to join the Hammers as Downing's replacement - something that is expected to be rectified in the near future.
Where would Lanzini play for West Ham?
The Argentine is a technically gifted playmaker who thrives in the No. 10 role - suggesting that new manager Slaven Bilic will be going with one of two formations.
He could stick with the 4-4-2 diamond played by former boss Sam Allardyce last season, or he could work with a 4-2-3-1 system - as he did with former club Besiktas.
Either formation would allow Lanzini to play in his favoured central attacking midfield role, where has made his name in Argentina and the United Arab Emirates.