Tottenham Hotspur are poised to complete the signing of England midfielder Scott Parker from West Ham.
The 30-year-old was not included in the Hammers squad for their 4-1 win over Nottingham Forest on Sunday afternoon.
Hammers boss Sam Allardyce said before the game that the former Newcastle man was not "mentally right to play".
But following the win, he confirmed: "We will miss a player of Parker's quality, and we want him with us if the negotiation doesn't go through."
He added: "Whether the deal is achievable yet, I'm not sure, I've had lots of conversations with the chairman."
"If he does actually leave, I need to replace him immediately. I don't expect any other player to leave before Wednesday," Allardyce added.
"I'm more interested in strengthening the squad, we need numbers. We need to add a few more players. The 17 I've got are very good but we need a few more."
Tottenham are expected to include a loan deal for one of their youngsters in the package.
Parker, who joined West Ham from Newcastle for £7m in 2007, was named Football Writers' Association Footballer of the Year last season despite the club finishing bottom of the Premier League.