The Spain international midfielder, who has joined the Blues on loan from Atletico Madrid, takes a jersey last filled by Mateo Kovacic
Chelsea have officially announced Saul Niguez's squad number at Stamford Bridge, with the Spain international midfielder taking the No 17 jersey in west London.
The 26-year-old has arrived in English football on a deal that includes the option for a permanent transfer in 2022.
Saul takes the shirt that has been vacated by Chelsea's new No 8, Mateo Kovacic.
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What has been said?
A statement on the Blues' official website says: "The Spanish midfielder moved to Stamford Bridge on transfer deadline day in a one-year loan from Atletico Madrid, with an option to make the move permanent next summer.