Chelsea will be expected to move quickly after the European Conference League on Wednesday to sign a new striker.
Senior Executives have drawn up a shortlist with names with Liam Delap, Benjamin Sesko, Hugo Ekitike and Viktor Gyokeres.
Provisional questions have been asked to set the availability of selected goals.
These contacts are performed after Wednesday, because a special early transfer window is opened for 10 days on Sunday.
Chelsea will strengthen their team before flying to the United States on June 16 for their opening match at the Club World Cup in Atlanta.
Delap has a release clause of £ 30 million, which can be activated if Ipswich Town is banned from the Premier League.
It fits with the profile of Spits Chelsea, and the total costs of the deal – including wages – are another important consideration.
Chelsea's recruitment strategy is the signing of young, the development of players on long, stimulated contracts.
Delap is 22, has Premier League experience and collaborated with Chelsea head coach Enzo Maresca and co-director Joe Shields in Manchester City.
Chelsea is confronted with competition from Manchester United and Newcastle United, who are also willing to pay the release clause from Delap.
Chelsea has to sign another attacker, because Christopher Nunku will probably leave this summer.
Sky in Germany reports that Chelsea is in conversation to sign the 22-year-old Eintracht Frankfurt Vooruit Ekitike.
They believe that Chelsea “makes the most effort” to sign the player who is appreciated at € 100 million [£84m].
Liverpool would also be interested.
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Premier League clubs Chelsea and Manchester City compete with people like Real Madrid, Bayern Munich, Paris Saint-Germain and Inter Milan.