The Hammers have strengthened their goalkeeping, defensive and midfield options this summer with a raft of new signings, but have now been left short in attack after Enner Valencia joined Andy Carroll on the sidelines with an injury.
Manager Bilic is in danger of relying too heavily on Diafra Sakho, and whilst the Senegal international impressed in his debut Premier League season last term, he needs support this season.
As a result, West Ham are pushing ahead to sign Atletico Madrid's Jimenez on loan for the season - and AS report that the final hurdle in the deal has been completed, with Jimenez being granted a work permit.
Despite being a Mexican international, the 24-year-old didn't fit in with new guidelines in the Premier League, but has seemingly been given dispensation to join West Ham and play in the Premier League, according to Spanish newspaper AS.
Jimenez scored just once last season for Atletico, but his record of 39 goals in 102 games for previous club America is far more impressive, and he has the size and strength to play as a centre forward.
A move to England is reportedly drawing closer for Jimenez, who will be keen to follow in the footsteps of his international team-mate Javier Hernandez and prove himself in the Premier League - and possibly earn himself a permanent move to Upton Park in the process.