Mateo Kovacic has shaken off a hamstring injury and N'Golo Kante is back after Achilles tendon pain.
Andreas Christensen has also beaten a leg tendon issue.
Jonny Evans faces a race to be fit for the Foxes' first FA Cup final since 1969.
The defender has been nursing a heel problem which has forced him to miss the last two games and he will be given until the last minute to prove his fitness.
Chelsea provisional squad: Arrizabalaga, Rudiger, Alonso, Christensen, Jorginho, Silva, Kante, Abraham, Pulisic, Werner, Caballero, Zouma, Kovacic, Mendy, Giroud, Mount, Hudson-Odoi, Chilwell, Ziyech, James, Azpilicueta, Havertz, Palmieri, Gilmour, Anjorin.
Leicester provisional squad: Schmeichel, Ward, Jakupovic, Fuchs, Fofana, Soyuncu, Pereira, Evans, Daley-Campbell, Castagne, Thomas, Choudhury, Tavares, Ndidi, Tielemans, Maddison, Mendy, Amartey, Praet, Under, Perez, Albrighton, Vardy, Iheanacho.