Allardyce wrote in the London Evening Standard: "This has been a tough learning curve for David and he will be assessing how he attacks the job in the future. He knows he must re-establish United to where they need to be.
"Everyone knew it would be difficult for the man who replaced Sir Alex Ferguson but I don't think David would have thought it was going to be this much of a challenge.
"I hope that, in the end, he will become as successful as his predecessor. There was a transition when Sir Alex went to United but in the modern day game, David knows he will not be accorded the same sort of time as back then. These days, you have to work as quickly as you can.
"I would say he has found out an awful lot about his squad of players over the past few months. He will have seen them from the outside but you don't really get to know players until you work with them regularly.
"Come the end of the season, he will have to make some tough decisions about a number of players, decisions we, as managers, all have to make."
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