Chelsea is one of the clubs that like to be on West Ham's Mohammed Kudus.
Kudus has a £ 85 million clause for Premier League clubs, active for the first 10 days of July.
The blues remain Jamie Gittens from Borussia Dortmund, Hugo Ekitike in Frankfurt and Joao Pedro by Brighton. It is expected that a bid for gittens will be going this week.
The latter is also on lists in Newcastle United and Arsenal.
Chelsea also spoke with AC Milan about goalkeeper Mike Maignan, who could leave for only £ 25 million this month.
The 29-year-old still had a year on contract and Chelsea could discharge Djordje Petrovic who is interested in West Ham.
The side of Enzo Maresca has been set to sign Liam Delap from Ipswich after activating the £ 30m release clause and the agreing of personal conditions.
They also announced the arrival of Dario Essugo of Sporting Lisbon for £ 18.5 after the two clubs had reached an agreement in March.
Chelsea hopes to add to their team prior to Club's World Cup.
The blues start their campaign against Los Angeles FC on June 16 for matches against Flamengo and Es Tunis.