Pompey boss Steve Cotterill thinks that the details of Ben-Haim's personal terms have required additional discussions to delay the transfer.
Cotterill said in The News: "I feel sorry for Tal. One minute he's here and the next he's not.
"I think he's on his way to West Ham and he will go there.
"There's a lot of to-ing and fro-ing going on with his terms, though."