Former West Ham coach Stuart Pearce has questioned their move for Sassuolo striker Gianluca Scamacca.
West Ham have had a bid for the Italy international accepted by Sassuolo.
But Pearce says: "They (West Ham) are looking for additions up front.
“I have seen bits of Scamacca. The biggest hardship you have got is when you bring players from foreign countries, whether they are going to hit it off or not.
"To turn around and say 'yes, he's going to be a definite, no doubt about it, he's going to hit the ground running'. It's impossible."