Manchester United midfielder Ravel Morrison was this lunchtime having a medical with West Ham.
Press Association Sport understands that providing there are no unexpected hitches, the 18-year-old will join the Championship promotion hopefuls before the transfer deadline at 11pm tonight.
The Manchester United teenager has had a chequered career so far. However, although United wanted him to stay, Morrison has opted to cut his ties with the Old Trafford outfit.
"The deal is not quite done yet but we are hopeful it will be completed," Allardyce told the London Evening Standard.
"Ravel is a talented lad and if he really wants to be a player then we will help him as much as we can along the way.
"Perhaps a change of environment will be beneficial to him and help him make that step up to first team football quicker than perhaps would have been the case at Manchester United. There is no doubt he has exceptional talent."