West Ham United hope to unveil their first 'major' signing of the summer.
So far the Hammers have snapped up goalkeeper Darren Randolph on a free transfer from Birmingham City as back-up for number one Adrian.
But the East Londoners know they are going to need a big squad after securing European football for their final season at the Boleyn Ground via the FIFA Fair Play standings.
It means the 2015/16 campaign will start over a month earlier than normal on July 2 with the draw for the first qualifying round due to be made on June 22.
Therefore the pressure is on to bolster the squad in the coming weeks ready for their important Europa League qualifiers, which would see the play four two-legged ties before a ball is even kicked in the Premier League next season if they are successful.
With new manager Slaven Bilic unveiled earlier today, the club has now followed up the Croatian's appointment with the announcement that they expect to clinch their first big signing of the close season in the coming hours.
A post sent out on the club's official Twitter account at 7.30pm on Tuesday said: "West Ham United hope to announce a major new signing within the next 24 hours. Watch this space!"
BREAKING: West Ham United hope to announce a major new signing within the next 24 hours. Watch this space! #WHUFC— West Ham United FC (@whufc_official) June 9, 2015
At around the same time, Jack Sullivan, the teenage son of West Ham co-owner David Sullivan, tweeted a message of his own to Hammers fans, saying the signing is "95% certain".
He said: "95% that we will announce our first big signing of the summer tomorrow," before urging fans to keep checking his tweets to 'get the news first'.
95% that we will announce our first big signing of the summer tomorrow. Keep checking @jsullivanwhu to get the news first— Jack Sullivan (@jsullivanwhu) June 9, 2015
The Hammers have been linked with a host of players from across Europe since Sam Allardyce's departure.
The 23-year-old is a former Spain under-21 international who was released by hometown club Atletico Madrid's youth team in 2008 and worked his way up through Sampdoria's youth system before flourishing in the Italian side's first team.
The Hammers are believed to have fought off interest from Serie A giants AC Milan and fierce rivals Tottenham Hotspur for his signature.