West Ham are close to completing the re-signing of goalkeeper Darren Randolph from Middlesbrough for £4m.
New Hammers boss David Moyes wants to bring in reinforcements after the disastrous performances of second-choice Roberto during Lucasz Fabianski's three-month absence with a thigh injury.
Randolph is set to be one of a number of new arrivals as Moyes looks to guide the Hammers away from relegation trouble, with the club 16th and two points above Bournemouth in 18th.
The Republic of Ireland international spent two seasons with the Hammers between 2015 and 2017 before joining Boro in a £5m move in July 2017.
West Ham also have a strong interest in Benfica midfielder Gedson Fernandes, although it is understood they are initially trying to sign the 20-year-old on loan.