West Ham United's move for Duvan Zapata has stalled.

West Ham are considering an appeal for a work permit for Colombian Duvan Zapata in a £6.8m deal from Argentinian side Estudiantes.

"It is whether we think we can get the work permit through, that is the problem," said Hammers boss Sam Allardyce.

"The fact he is not a full international would mean we have to go to a hearing, and we have to decide if that is worth doing, which we will decide in the next 24 hours, but we would like to (get him) if we could."