The Hammers have invested over £40m so far in transfer, signing on and agent fees on Ryan Fredericks, Issa Diop and Lukasz Fabianski but will look to spend in excess of £60m bringing in another three to five players before the transfer window slams shut at 5 pm on 9th August.
However, the West Ham net spend on transfers will need to remain around £70m so they will look to balance the financial books.
The most obvious Hammers outbound candidates for to raise £30m are Robert Snodgrass £9m, Jordan Hugill £7m, Edimilson Fernandes £6m, Sam Byram £5m and Reece Burke £3m.
West Ham would be extremely reluctant to part with Marko Arnautovic, Javier Hernandez, Michail Antonio, Declan Rice or Pedro Obiang while the chance of offloading Andy Carroll seems unlikely.