For a while, it looked like David Moyes might carry on this summer. The Scotsman's challenge now is to get everything right in the transfer market, both inside and outside.
If he can invest all the money Arsenal will pay for Declan Rice, he could really give his club the strength it needs for its stay in Europe and its domestic assignments.
However, for every player that comes in, there needs to be more than just a general focus on the players the club already has on its books.
Do they want to keep everyone and can they afford it? Do some players see their future elsewhere?
A player with just one year left on his contract at the London Stadium is the Hammers' all-time Premier League top scorer Michail Antonio.
According to the Daily Mail, the 33-year-old striker was questioned by Galatasaray, a Champions League club.