Overview

• The 23-year-old left Chelsea’s pre-match routine at the London Stadium after he "felt something," according to Enzo Maresca on Sky Sports.
• Chelsea confirmed teenager Estevao Willian started in Palmer’s place, marking the Brazilian’s first Premier League start.
• Palmer was seen going down the tunnel during the warm-up and later appeared on the bench shortly before kickoff, reporters on site noted.
• The club has not provided a medical update, leaving the extent and any timeline unclear as the transfer window remains open.
• West Ham took an early lead through Lucas Paqueta as the reshuffled visitors adjusted to the late change, according to match reports.