The goalkeeping issue in the squad has been spoken by Chelsea boss Mauricio Pochettino.
Prior to their Premier League debut, Pochettino told reporters on Friday that Kepa Arizabalaga is his top pick.
On Sunday against Liverpool, Kepa, who has been linked with a move to Bayern Munich this summer, is expected to get the start.
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“Sánchez and Kepa know they are going to fight for the n1 position. At the moment, Kepa is a little bit ahead.
“With time, we will see if Robert is there and can challenge Kepa,” Pochettino said on Kepa.
Sanchez moved to Stamford Bridge from Brighton this summer for a £25 million fee.