Maresca made 11 changes from the team that beat West Ham 3-0 on Saturday but could still start around £400 million ($533 million) worth of talent.
Joao Felix was another of the Blues’ big-money signings to shine. His scooped pass set up Nkunku for opener.
Nkunku then flicked home a second before Felix’s free-kick hit the post and rebounded in off Barrow goalkeeper Paul Farman.
Pedro Neto tapped in Mykhailo Mudryk’s cross for his first Chelsea goal. Nkunku sealed his first hat-trick for the club when he dispossessed Farman and rolled into an empty net.
City began what is likely to be many months without key midfielder Rodri after he suffered suspected knee ligament damage in a fiery 2-2 draw against Arsenal in the Premier League on Sunday.
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