The Red Devils are enduring a difficult first season since Sir Alex Ferguson's retirement, and the pressure is piling on Moyes after United's 2-0 Champions League defeat to Olympiacos in midweek.
It seems that there will be a mass exodus from Old Trafford in the summer, as well as a number of players arriving at the club in a bid to get the club back to winning ways, and Hammers boss Allardyce believes that they may need to spend around £200m to get the squad to Moyes' liking.
“David is left with having to make more decisions about players at the end of the season than he expected. It looks like he will have to plan a rebuild and for a club like United, that could mean an outlay of £200million," said 'Big Sam'.
“As a manager, it is almost expected that your first rebuild is when you come into a club unless you inherit, ironically, as good a squad as Roberto Martinez has at Everton. Then it’s about reaffirming your position and doing as well as the manager you have succeeded.
“The hard bit, even if you are United, is finding the players. They didn’t do that last summer and that’s probably one of things David now regrets.”
A number of world class stars have been linked with a move to United ahead of the summer, but Allardyce hit on a key point in that United failed to strengthen heavily when Moyes got the job. He has brought in just two first team players since taking over from Sir Alex, with Marouane Fellaini and Juan Mata arriving from Everton and Chelsea respectively.
The Red Devils also missed out on a number of key targets in the summer, and will need to be far more productive in the transfer market, particularly in the likelihood that they have no Champions League football to offer to potential targets.
image: © Ben Sutherland