West Ham co-owner David Sullivan expects the club to announce another new signing within the next three weeks.
The Hammers have been linked with a number of players recently - reports on Tuesday suggested they were interested in Argentinian playmaker Juan Roman Riquelme - and they are determined to follow-up on the signing of German midfielder Thomas Hitzlsperger before the start of pre-season training.
"It is only right that we keep supporters informed as much as we can of what we are working on, especially as there is so much speculation around this time of year," said chairman Sullivan.
"With the World Cup taking place, it is not as easy to conclude deals but I can assure fans we are working 24/7 with the manager to bring new players to the club.
"We have limited resources, with the £100m debt the club carries, but we are going to make every penny count and we 100% assure you there will be more new arrivals this summer.
"It is very possible we will have another one in within the next two to three weeks, if not sooner."
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