Pastore are in talks with the Hammers, but agent Bruno Satin hints the Argentina international's personal terms could see the Premier League club move on.
Satin told RMC: "The media often misunderstand things, see only the transfer aspect and forget the salary aspect ... Pastore, nobody will give him the equivalent, so we must make a downward transfer to offset what the salary will represent.
"And the Argentineans are not known to make discounts ... if there is a euro on the ground, they scratch the ground! It's impressive. They are professionals, they are there to make money."