The pair started their game against Brighton over the weekend and stayed in their place, with Chalobah lining up as a three-man defender for the hosts and Gallagher appearing to be given a more senior role.
Kai Havertz trained at Cobham on Monday and was benched, while N’Golo Kante and Thiago Silva, both rested against Brighton, also returned.
Interim Blues manager Frank Lampard is particularly motivated by Havertz’s return, as the German is the club’s top scorer this season with nine goals in all competitions. .
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Lampard had said that Havertz was a minor doubt ahead of his 2-1 loss to Brighton, saying “Kai has had a bit of a problem with his knee, which he felt in Madrid last night. Wednesday. He will be fine on Tuesday.
Ben Chilwell is also suspended after receiving a red card last week in the Spanish capital, so Marc Cucurella starts at left-back.
Kante will start in midfield alongside Mateo Kovacic and Enzo Fernandez while Havertz replaces Mykhailo Mudryk. Benoit Badiashile, Pierre-Emerick Aubameyang, David Datro Fofana and Noni Madueke are also not registered in Europe.
start XI: Kepa, James, Silva, Fofana, Chalobah, Cucurella, Kovacic, Kante, Fernandez, Gallagher, Havertz.
Prep: mendy; Zakaria, Mount, Loftus-Cheek, Mudryk, Felix, Sterling, Ziyech, Azpiliuceta, Hall, Chukwuemeka
