The West Ham United boss has questioned United's treatment of David Moyes after a summer transfer splurge that saw them spend just north of £150 million on new recruits.
New United manager Louis van Gaal was able to bring in six players during the course of the summer transfer window, whereas ex-manager Moyes was only able to sign one and that was Maraoune Fellaini in the dying minutes of last season's transfer deadline day.
And it is this failure from the United hierarchy that Allardyce believes left Moyes in a near impossible position. He spoke ahead of his side's clash with United at Old Trafford this Saturday:
"If I was sat at home in David's shoes I would be wondering why they didn't spend the £150m with me.
"There was a complacency by United in not going out and delivering the signings David felt he needed. Now there's a panic on.
"He will obviously look at what he might have done better but he should have got the players he wanted and he tells me he didn't get any of them.
"It was difficult enough taking over from Alex Ferguson but if, when you take over, you don't get what you want, it's so much harder. It was a great shame because he'd done everything right at Everton and Sir Alex saw the fact he wanted to build at United like he had done at Everton."
It should however be noted that many of players David Moyes wanted to bring to Old Trafford were much too unrealistic for him. Cesc Fabregas, now at Chelsea, was reported to be his main target for most of summer 2013, but the Spaniard was never interested in joining the Red Devils, and he made no secret of that.
Also Moyes has recently revealed that he was interested in signing both Cristiano Ronaldo and Gareth Bale, who ended up fulfilling a boyhood ambition of signing for Spanish giants Real Madrid.
Perhaps if Moyes had chosen more realistic targets he might have been able to spend more of the war chest that United had offered him.